The shoe store bought a batch of shoes, and the selling price was 15% higher than the original price. If 80 pairs were sold, the loss would be 64 yuan. If all of them were sold, the profit would be 120 yuan. How much is the purchase price of each pair of shoes?
鞋店进了一批鞋，卖出的价钱比原价提高了15%，如果卖出去80双，则亏本64元，如果全部卖出，可以赚120元，问每双鞋进价多少元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">120 / (3/20)</gadget>
<output>800</output>

<gadget id="calculator">800 - 64</gadget>
<output>736</output>

<gadget id="calculator">736 / 80</gadget>
<output>46/5 = around 9.2</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">(46/5) / (23/20)</gadget>
<output>8</output>

<result>8</result>