A store bought 60 pens at a price of 3.9 yuan, and then sold them all at a price of 4.5 yuan. How much money does the store make?
某商店以3.9元的价格购入钢笔60支，后以4.5元的价格全部售出．请问商店赚了多少钱？
<gadget id="calculator">4.5 - 3.9</gadget>
<output>0.6</output>

<gadget id="calculator">0.6 * 60</gadget>
<output>36</output>

<result>36</result>