A sum of money at simple interest amounts to ₹ 1860 in 2 years and to ₹1930 in 3 years. What is the sum?
₹ 1720
S.I. for 1 year = ₹ (1930 - 1860) = ₹ 70.
( Since the amount is given at the 2 years and 3 years )
S.I. for 2 years = ₹ (70 × 2) = ₹ 140
(Since simple interest is same for every year )
Principal = Amount - Interest
= ₹ 1860 - ₹ 140
= ₹ 1720