Aptitude Day 192

Problems on Simple Interest:

1. A sum invested at 3% simple interest p.a. grows to 180 in 2 years. The same amount at 5% simple interest p.a. in 1(1/2) years will grow to:

Solution:

                P = 180*100/3*2 = 3000.

                S.I = (3000*5*3/2)/100

                S.I = 90.

2. What will be the ratio of simple interest earned by a certain amount at the same rate of interest for 11 years and that for 22 years?

Solution:

                P(11)R/100 : P(22)R/100

                11:22

                1:2.