A man was allotted a rectangular plot measuring 20 m * 15 m. On measuring, he found that its length decreases by 10% and breadth increases by 15% Find the percentage increase in its area.
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Answer:
area increase = 3.5%
GIVEN ,
size of the plot = 20 × 15 m
decrease in lenght = 10%
increase in breadth = 15%
To get : percentage increase in area
SOLUTION
new lenght = 20×(1-0.1)
= 18m
new breadth = 15(1+0.15)
= 17.25
new area = 18 × 17.25
= 310.5m^2
given area = 20×15m^2
= 300m^2
percentage increase in area = 310.5 - 3000/3000 × 100
= 3.5
hence % increase in the area is 3.5%
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