large mathematics dictionary is priced at 80 yuan, and the profit is 25% of the cost. If the profit is increased to 35%, how much should the price be increased.
一本数学大辞典售价80元，利润是成本的25%，如果把利润提高到35%，那么应提高售价多少元．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 / (5/4)</gadget>
<output>64</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 + (7/20)</gadget>
<output>27/20 = around 1.35</output>

<gadget id="calculator">64 * (27/20)</gadget>
<output>432/5 = around 86.4</output>

<gadget id="calculator">(432/5) - 80</gadget>
<output>32/5 = around 6.4</output>

<result>32/5 = around 6.4</result>