Chenguang Stationery Store wholesaled 24 pencil cases for 300 yuan in August this year, and the retail price was 15 yuan each. How much profit can it make when selling 20 pencil boxes?
晨光文具店今年8月份用300元批发了24只文具盒，零售价每只15元，卖出20个文具盒时，可盈利多少元？
<gadget id="calculator">300 / 24</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">15 - (25/2)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 20</gadget>
<output>50</output>

<result>50</result>