80 kilograms of rice, after using 25% of it, add another 25%, what is the result in kilograms
80千克大米，用去它的25%以后，再增加25%，结果是多少千克
<gadget id="calculator">25 / 100</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">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">80 * (3/4) * (5/4)</gadget>
<output>75</output>

<result>75</result>