Ramees professes to sell his goods at the cost price but he made use of 900 grms instead of a kg, what is the gain percent?

A. 160m × 27m
B. 240m × 18m
C. 120m × 36m
D. 135m × 32m
Let the side of smaller square at the extreme right be a

Then side of the larger square is 3a

Total area of the field = a2 + a2 +a2 + (3a)2 +(3a)2 = 30a2

Therefore, 30 a2 = 4320 => a2 = 432 / 3 = 144 => a = 12

Smaller side of the field = 36

Larger side of the field = (3a) × 3 + a = 10 a = 10 × 12 = 120

Original Dimensions of the field = 120m × 36m