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mathvariant="normal"> </mi><mn>4</mn><mi mathvariant="normal"> </mi><mi>pen</mi><mi mathvariant="normal"> </mi><mo>=</mo><mi mathvariant="normal"> </mi><mn>5</mn><mo>.10</mo><mi mathvariant="normal"> </mi><mo>×</mo><mi mathvariant="normal"> </mi><mn>4</mn><mi mathvariant="normal"> </mi><mo>=</mo><mo> </mo><mi>R</mi><mi>s</mi><mo>.</mo><mi mathvariant="normal"> </mi><mn>20</mn><mo>.40</mo></math>--><defs><style 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font-family="Arial" font-size="16" text-anchor="middle" x="16.5" y="16">Cost</text><text font-family="Arial" font-size="16" text-anchor="middle" x="43.5" y="16">of</text><text font-family="Arial" font-size="16" text-anchor="middle" x="58.5" y="16">5</text><text font-family="Arial" font-size="16" text-anchor="middle" x="84.5" y="16">pens</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="114.5" y="16">=</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="133.5" y="16">R</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="143.5" y="16">s</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="150.5" y="16">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="166.5" y="16">25</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="178.5" y="16">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="189.5" y="16">50</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="8.5" y="51">∴</text><text font-family="Arial" font-size="16" text-anchor="middle" x="37.5" y="51">Cost</text><text font-family="Arial" font-size="16" text-anchor="middle" x="64.5" y="51">of</text><text font-family="Arial" font-size="16" text-anchor="middle" x="79.5" y="51">1</text><text font-family="Arial" font-size="16" text-anchor="middle" x="101.5" y="51">pen</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="127.5" y="51">=</text><line stroke="#000000" stroke-linecap="square" stroke-width="1" x1="142.5" x2="188.5" y1="45.5" y2="45.5"/><text font-family="Arial" font-size="16" text-anchor="middle" x="153.5" y="40">25</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="165.5" y="40">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="176.5" y="40">50</text><text font-family="Arial" font-size="16" text-anchor="middle" x="165.5" y="62">5</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="199.5" y="51">=</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="214.5" y="51">R</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="224.5" y="51">s</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="231.5" y="51">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="242.5" y="51">5</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="250.5" y="51">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="261.5" y="51">10</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="8.5" y="86">∴</text><text font-family="Arial" font-size="16" text-anchor="middle" x="37.5" y="86">Cost</text><text font-family="Arial" font-size="16" text-anchor="middle" x="64.5" y="86">of</text><text font-family="Arial" font-size="16" text-anchor="middle" x="79.5" y="86">4</text><text font-family="Arial" font-size="16" text-anchor="middle" x="101.5" y="86">pen</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="127.5" y="86">=</text><text font-family="Arial" font-size="16" text-anchor="middle" x="144.5" y="86">5</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="152.5" y="86">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="163.5" y="86">10</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="185.5" y="86">×</text><text font-family="Arial" font-size="16" text-anchor="middle" x="201.5" y="86">4</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="218.5" y="86">=</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="237.5" y="86">R</text><text font-family="Arial" font-size="16" font-style="italic" text-anchor="middle" x="247.5" y="86">s</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="254.5" y="86">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="270.5" y="86">20</text><text font-family="math17b6e9c3968bb7f20cde276f121" font-size="16" text-anchor="middle" x="282.5" y="86">.</text><text font-family="Arial" font-size="16" text-anchor="middle" x="293.5" y="86">40</text></svg>