After the price of schoolbags in the store is reduced (1/4), the price is increased (1/5). The final price is 8 yuan and 1 jiao, so how much is it at the beginning?
商店的书包降价(1/4)后，又提价(1/5)，最后的价格是8元1角一个，那么最初是多少元钱一个．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">81 / (6/5) / (3/4) / 10</gadget>
<output>9</output>

<result>9</result>