There is a trapezoidal open space in the school, its upper base is 24m, lower base is 60m, and its height is 30m. Plant cannas in this field. If each canna covers an area of 0.8m**2, how many cannas can be planted in this field?
学校里有一块梯形形状的空地，它的上底是24m，下底是60m，高是30m．在这块地种上美人蕉，如果每棵美人蕉占地0.8m**2，这块地里可以种美人蕉多少棵？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">24 + 60</gadget>
<output>84</output>

<gadget id="calculator">(1/2) * 84 * 30</gadget>
<output>1_260</output>

<gadget id="calculator">1_260 / 0.8</gadget>
<output>1_575</output>

<result>1_575</result>