Uncle Li at the fruit shop bought 2 boxes of Red Fuji apples for 80 yuan, each with a net weight of 15 kilograms, and then sold them at 4.5 yuan per kilogram. How much money will he make after these apples are sold out?
水果店的李伯伯花80元购进2箱红富士苹果，每箱净重15千克，此后以每千克4.5元卖出．这些苹果卖完后，他一共可赚多少钱？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">4.5 * 30</gadget>
<output>135</output>

<gadget id="calculator">135 - 80</gadget>
<output>55</output>

<result>55</result>