3 ft = 1 yd
so we have
6 ft = 2 yd . . . . . multiply the above equation by 2
12 ft = 4 yd . . . . multiply the previous equation by 2
The dimensions of the room are 2 yd by 4 yd, so the area is
... A = W×L = (2 yd)×(4 yd) = 8 yd²
The cost is $10/yd², so we multiply this figure by the number of yd² to get the total cost.
... cost = ($10/yd²)×(8 yd²) = $80
It will cost $80 to carpet the room.
