A toy store buys 1,500 balls at a wholesale price of 2.5 yuan each, and then sells them at a retail price of 2.8 yuan each. How much gross profit can they make if they are all sold out?
玩具店按批发价买进每个2.5元皮球1500个，然后按每个2.8元的零售价出售，全部卖完可获毛利多少元？
<gadget id="calculator">2.8 - 2.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 * 1_500</gadget>
<output>450</output>

<result>450</result>