The original price of a refrigerator is 5,000 yuan, but the price dropped by 10% last year, and it is sold at a 20% discount this year, so how much is a refrigerator this year?
一台冰箱原价5000元，去年价格降了10%，今年又打八折出售，则今年一台冰箱多少元．
<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 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_000 * (9/10) * (4/5)</gadget>
<output>3_600</output>

<result>3_600</result>