A cistern 10 m long and 8 m wide contains water up to a depth of 1 m 50 cm. The total area of the wet surface is:
Choose the most appropriate option
A) 120 m 2 B) 136 m 2 C) 128 m 2 D) 130 m 2 E) 134 m 2

Rationale: "area of the wet surface = [ 2 ( lb + bh + lh ) - lb ] = 2 ( bh + lh ) + lb = [ 2 ( 8 x 1.50 + 10 x 1.50 ) + 8 x 10 ] m 2 = 134 m 2 . answer : e"
Answer: E