Okay so 1/4 of the 12 trees is 3 of the 12 trees so those 3 trees will cost $75 (3 x 25=75). Next, 1/3 of 12 is 4 so you multiply 4 by $35 which will be $140. So far, there are 7 trees and the rest cost $50 so that means 5 trees cost $50 each. You multiply 5 by $50 and your answer will be $250. Lastly, you will need to add $75, $140, and $250 together. Then you will get your answer $465.