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if ₹640 becomes ₹768 in 2 & half years (30 months) then rate of interest is?
Interest: ₹768 - ₹640= ₹128
Principal ₹640 for a duration of 30 months = Total interest ₹128 then Interest % = ?
128/640*100 = 30/18*12=8%
Then Interest on ₹850 @ 8% for 1 year
8/100*850 = ₹68
Then Interest for 3 Years = ₹68*3 = ₹204
Principal + Interest = ₹850 + ₹204 = ₹1054
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