After increasing 80 by 10%, then decreasing it by 10%, what is the result?
把80增加10%后，再减少10%，结果是多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

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

<gadget id="calculator">80 * (11/10) * (9/10)</gadget>
<output>396/5 = around 79.2</output>

<result>396/5 = around 79.2</result>