There are 25 sets of children's clothing in the store, the original price is 87 yuan each. The actual price is only 63 yuan per set. After selling these children's clothes in this way, how much less was the total sales?
商店里有25套儿童服装，原价每套87元．实际每套只卖63元．这样卖完这些儿童服装，一共比原来少卖了多少元？
<gadget id="calculator">87 * 25</gadget>
<output>2_175</output>

<gadget id="calculator">63 * 25</gadget>
<output>1_575</output>

<gadget id="calculator">2_175 - 1_575</gadget>
<output>600</output>

<result>600</result>