On number 3 plz explain to me i don't understand this because problem

So first you find the area of thr big square which is 14*20=280. Then you find the area of the small rectangle which is 9*5=45. then you subtract the small rectangles are from the big ones which leaves you with 235yd^2

Ithink you're supposed to multiply 12.50 which is how much he makes per hour and then multiply it by each number then add whats left togrther and there's your answer

I’ll you if you answer my questions!