Plant poplar trees in a trapezoidal field with an upper base of 100 meters, a lower base of 60 meters, and a height of 50 meters. If one tree is planted every 5 square meters, how many trees can be planted in total?
在一块上底100米，下底60米，高50米的梯形地里种杨树，每5平方米种一棵，一共可种多少棵？
<result>80</result>