Postal or Sorting Assistants Model Paper 8 With Solutions

(b) Area oftowel = l*b =100 cm x 50 cm = 5000 $\mathit{c}{\mathit{m}}^2$
Now, length decreased by 20% and breadth decreased by 10%
r= 100-20% of 100 = 80cm
b’ = 50 -10% of 50 = 45cm
New area = 1' x b' = 80cm x 45cm = 3600 $\mathit{c}{\mathit{m}}^2$
Change in area = (5000 - 3600) $\mathit{c}{\mathit{m}}^2$ = 1400 $\mathit{c}{\mathit{m}}^2$
% change in area =$\frac{1400}{5000}\times 100=28\%$