18,21,25,35,52,78,115

1,2,6,21,88,505,2676

10080,1440,240,48,12,3,2

6, 4 ,5 ,8.5 ,18 ,48 ,139

Amount invested by Gautam in scheme S is equal to the amount invested by him in scheme N. The rate of interest (p.c.p.a.) of scheme S and N are the same. The only difference is that scheme S offers compound interest (compounded annually)whereas the scheme N offers simple interest. If the difference between the interest earned by Gautam from both the schemes after 2 years is INR 349.92, what is the rate of interest ?

Rudra invested in scheme R for 4 years. If scheme R offers simple interest at the rate of 7 p.c.p.a. for the first two years and then compound interest at the rate of 10 p.c.p.a. (compounded annually) for the third and fourth year, what will be the interest earned by Rudra after 4 years ?