The original price of a set of costumes is 125 yuan. When the school buys them, the price is reduced by 18 yuan. How much less will it cost to buy 36 sets of such costumes now?
一套演出服，原价125元，学校购买时，每套降价18元，现在购买36套这样的演出服，比原来少花多少元？
<gadget id="calculator">18 * 36</gadget>
<output>648</output>

<result>648</result>