A type of refrigerator is sold at a 20% discount, and a profit of 25% can still be obtained. What is the expected profit margin when pricing.
一种冰箱打八折出售，仍能获25%的利润，定价时的期望利润率是多少．
<gadget id="calculator">160 / 100</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(8/5) - 1</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>