The price of each refrigerator has been reduced by 10%, that is, the current price is the original price.
每台冰箱的价钱降低了10%，也就是现在的价钱是原来的多少．
<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>

<result>9/10 = around 0.9</result>