People’s Supermarket has bought a towel, the purchase price is 615 yuan per box, and there are 50 boxes in total. If each towel is sold at the retail price of 6.8 yuan, how much can you earn if you sell all the towels? (There are 100 towels in a box)
百姓超市进了一种毛巾，进货价每箱615元，共50箱，如果每块毛巾按零售价6.8元卖，全部卖出可赚多少元？(一箱内有100块毛巾)
<gadget id="calculator">50 * 100 * 6.8</gadget>
<output>34_000</output>

<gadget id="calculator">615 * 50</gadget>
<output>30_750</output>

<gadget id="calculator">34_000 - 30_750</gadget>
<output>3_250</output>

<result>3_250</result>