suit is now priced at 768 yuan, which is 512 yuan lower than before. How much is the reduction?
一套西服现在售价768元，比原来降低了512元，降低了百分之几？
<gadget id="calculator">768 + 512</gadget>
<output>1_280</output>

<gadget id="calculator">512 / 1_280</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>