Answer:
£8400
Step-by-step explanation:
solving step wise:
or
The ratio is 10 : 1, or 10 to 1
length : 15 ft
width : 3 ft
perimeter = 2×l(ength) + 2×w(idth) = 36
l = 3w + 6
=> 2×(3w+6) + 2w = 36
6w + 12 + 2w = 36
8w = 24
w = 3
=> l = 3w + 6 = 3×3 + 6 = 9+6=15