The original price of a tape recorder is 240 yuan, but the actual price is 180 yuan. How much is the actual price lower than the original price? How much discount is it on sale?
一台收录机的原价是240元，实际以180元售价，实际售价比原价降低百分之几？是打几折出售的？
<gadget id="calculator">180 / 240</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>