Simple Interest

81 The rates of simple interest in two banks×and y are in the ratio of 10 : 8. Rajini wants to deposit her total savings in two banks in such a way that she receives equal half-yearly interest from both. She should deposit the savings in banks×and y in the ratio of: 

82 A person borrows ₹ 5000 for 2 years at 4% p.a. Simple interest .He immediately lends it to another person at 6 1/4 % p.a. for 2 years .Find the gain in the transaction per year:

83 A sum of ₹725 is lent in the beginning of the year at a certain rate of interest. After 8 months, a sum of ₹362.50 more is lent but at a rate twice the former. At the end of the year, ₹ 33.50 is earned as interest from both the loans. What was the original rate of interest? 

84 A certain sum at a certain rate of SI amounts to ₹ 1125 in 4 yr and ₹ 1200 in 7 yr. Find the sum and rate of interest:

85 A person lent some amount to his friend at 20% S.I. After 2 years, ₹ 5000 was repaid and the rest amount was repaid 25% P.A. If 3rd year's interest is 6/11 of first 2 years intrest. Find the amount of money that was let out initially?

86 Find the interest on ₹ 800 at 10% per annum for 219 days. 

87 A sum of money doubles it'self in 4 years. What is the rate of interest? 

88 A sum of ₹ 7700 is lent out in two parts in such a way that the interest on one part at 20% for 5 yr is equal to that on another part at 9% for 6 yr. Find the two sums:

89 Find the simple interest on ₹ 1900 at 21 % per annum for 6 years

90 At the rate of 8.5% per annum simple interest, a sum of X 5800 will earn how much interest in 2 years 3 months?