Wang Po wholesaled 30 fruit popsicles for 22.5 yuan, and she sold them at a retail price of 1.2 yuan per stick. How much money can Wang Po earn after the sale?
王婆用22.5元批发了30枝水果冰棍，她以1.2元/枝的零售价售出，售完后王婆可以赚多少元钱？
<gadget id="calculator">1.2 * 30</gadget>
<output>36</output>

<gadget id="calculator">36 - 22.5</gadget>
<output>13.5</output>

<result>13.5</result>