The price of a piece of clothing is 128 yuan, which is 32 yuan cheaper than the original price. How much is it cheaper?
一件衣服售价128元，比原价便宜32元，便宜了百分之几？
<gadget id="calculator">128 + 32</gadget>
<output>160</output>

<gadget id="calculator">32 / 160</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>