A piece of eraser costs 80 cents, and a box of erasers costs 20 yuan. How much does it cost Mr. Zhang to buy 3 boxes of erasers?
一块橡皮8角钱，一盒橡皮有20块，张老师买了3盒橡皮需要花多少钱．
<gadget id="calculator">8 * 20 * 3</gadget>
<output>480</output>

<result>480</result>