Sasha heard that planting trees helps to reduce the local temperature. For each tree planted, the temperature drops .1 degree. A tree costs $6 to plant. If she got the local temperature to drop from 80 to 78.2, how much did it cost to plant the trees?
The temperature dropped 1.8 degrees because 80 -78.2 = <<80-78.2=1.8>>1.8
She planted 18 trees because 1.8 / .1 = <<1.8/.1=18>>18
It cost $108 to plant the trees because 18 x 6 = <<18*6=108>>108
#### 108