Question

The length and breadth of a rectangle is increased by 40% and 30%, then the

area will be increased by what % ?

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Answer 1

Answer:

82%

Step-by-step explanation:

Let the original length and breadth be l and b.

=> Original Area = lb

New length = l + 40% of l

                   = 140% of l = $\frac{140}{100}$ l

New breadth = b + 30% of b

                   = 130% of b = $\frac{130}{100}$ b

New area = New length x New breadth

                = $\frac{140}{100}$ l x $\frac{130}{100}$ b

                =   $\frac{140}{100}$ x $\frac{130}{100}$  lb

                = $\frac{182}{100}$ lb

                = 182% of lb

% Increase = new area - original area

                  = 182% of lb - 100% lb

                  =82% of lb