RRB Group D Model Paper 9 with solutions

(4) The decrease or increase in thearea can be found by successivepercentage rule, i.e. a + b + $\frac{\mathit{a}\mathit{b}}{100}$ .
Increase or decrease in area of thenew rectangle
= 10 - 10 + $\frac{-10\times 10}{100}$ = - 1%
Thus, the area will decrease by 1%