The length of a rectangle is increased by 10% and its width is reduced by 20%. Express the area of the new rectangle as a percentage of the area of the initial rectangle

A = (l+0.1l) * (b-0.2b)

Step-by-step explanation:

let the length and width be l and b

length = l + (10/100*l) = l+0.1l

width = b - (20/100*b) = b-0.2b

thus the area would be

A = (l+0.1l) * (b-0.2b)