The rectangular shaped building dimensions are P x Q. If the breadth is increased by 40% and the length is decreased by 30% then the % of area of the new building compared with previous one is:
Dimensions of the building = P x Q. Assume that, P is length and Q is breadth.
Area of original wall = PQ unit2.
New length (after decreasing 30%) = P– 30P/100 = 70P/100
New breadth (after increasing 40%) = P = P + 40P/100 = 140P/100.
New area = 70P/100 x 140P/100 = 49PQ/50.
Therefore, required % = (new area / original area ) x 100 = ((49PQ/50) / PQ) x 100= 98%.
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