commodity is 80 yuan, how much is it sold after two consecutive 10% price cuts?
一种商品80元，连续两次降价10%后卖多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">80 * (9/10) * (9/10)</gadget>
<output>324/5 = around 64.8</output>

<result>324/5 = around 64.8</result>