A certain sum when invested at compound interest (compounded annually) of 8% p.a. for 4 years, gives an interest of Rs. 4879.20. Calculate the approximate sum invested
ATQ, Let the sum invested be Rs. P. ATQ, 
Or, P+4879.2 = 1.3605P Or, 4879.2 = 1.3605P − P Or, 0.3605P = 4879.2 
13,534.553 or ~ 13,535
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