The pure milk in a supermarket used to be 52 yuan per box, but after the price reduction, it was 46 yuan per box. Now, if you want to buy 15 boxes of pure milk, how much less will it cost than before?
一超市的纯牛奶原来每箱52元，降价后每箱46元，现在要购买15箱纯牛奶，要比原来少花多少元？
<gadget id="calculator">52 - 46</gadget>
<output>6</output>

<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<result>90</result>