Question
The length and breadth of a rectangular field are
increased by 25% and 45%, respectively. If the original dimensions of the field are 60 m in length and 40 m in breadth, what is the percentage increase in the perimeter?Solution
Original perimeter of rectangular field = 2 × (60 + 40) = 200 m Increased length of rectangular field = 1.25 × 60 = 75 m Increased breadth of rectangular field = 1.45 × 40 = 58 m Increased perimeter of rectangular field = 2 × (75 + 58) = 266 m Required percentage increase = {(266 – 200)/200} × 100 = 33%
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