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### Mathematical Skills | Simple Interest and Compound Interest

 Q. No. 19: The difference between the interest received from two different banks on Rs 750 for 2 year is Rs 90. The difference between their rates is A : 4% B : 6% C : 8% D : 5% Solution
 Q. No. 20: A sum of Rs 10 is lent to be returned in 11 months installments of Rs 1 each, interest being simple. The rate of interest is A : 100/11 % B : 10% C : 11% D : 240/11 % Solution
 Q. No. 21: Mr. Jeevan wanted to give some amount of money to his two children, so that although today they may not be using it, in the future the money would be of use to them. He divides a sum of Rs.18,750/- between his two sons of age 10 years and 13 years respectively in such a way that each would receive the same amount at 3% p.a. Compound interest when he attains the age of 30 years.What would be the original share of the younger son? A : 8959.80 B : 8559.80 C : 8969.80 D : 8995.80 Solution
 Q. No. 22: Abhishek invests a principal in a simple interest based scheme, such that the rate of interest increases in a geometric progression every year with the common ratio 2. If the amount becomes four times in 4 years, then in how many years it will become 52 times? A : 5 years B : 8 years C : 13 years D : 10  years Solution
 Q. No. 23: Mantu deposited Rs 1000 at the start of the year 2008 in a bank offering interest 10% compounded annually. However, he used to withdraw a fixed amount at the end of the year. When Mantu withdrew that fixed amount at the end of year 2010, he discovered that no money is let in his deposit. Find that fixed amount? A : Rs 364.61 B : Rs 402.11 C : Rs 430.25 D : Rs 492.95 Solution
 Q. No. 24: At simple interest  Rs 5000 becomes Rs 6000 in four years. Now, if the rate of simple interest is doubled, then in how much time from now this amount become Rs 10,000? A : 72 months B : 80 months C : 84 months D : 76 months Solution
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