SOLUTION: If it costs $4000 to build a sidewald around a rectangular field whose dimenstions are 300 yd by 600 yd, how much will it cost to build a sidewald around a rectangular field whose

Question 165165: If it costs $4000 to build a sidewald around a rectangular field whose dimenstions are 300 yd by 600 yd, how much will it cost to build a sidewald around a rectangular field whose dimenstions are 200 yd by 600 yd?
Found 2 solutions by checkley77, MRperkins:
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
4000/(2*300+2*400)=x/(2*200+2*600)
4000/(600+800)=x/(400+1200)
4000/1400=x/1600
1400x=1600*4000
1400x=6,400,000
x=6,400,000/1,400
x=$4,571.43 is the cost of the new sidewald.
Answer by MRperkins(300) (Show Source): You can put this solution on YOUR website!
Find the perimeter of the first field

.
and then divide the total cost by the perimeter to find the cost/yard of construction.

.
Next find the perimeter of the second field

Plug the perimeter into the formula cost=perimeter*(cost/yard).

.
cost=$3555.56
.

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