The price of a washing machine is first reduced by 30%, and then the price is increased by 25% after the price reduction. The current price is the price before the price reduction.
一台洗衣机先降价30%，接着按降价后的价格又提高了25%，现在的价格是为降价前的价格的多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(7/10) * (5/4)</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>