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Anuj s.
Profit At 1st year 5% 2nd year 7% 3rd year 10% 4th year 10% let principal=p p * (1 + 5/100) * (1 + 7/100) * (1 + 10/100) * (1 + 10/100) = 990000000 => p = 73 crores (app.)