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 ?

What is the average amount invested by Gautam in schemes M,N,O,P and Q together ?

If Scheme O offers compound interest (compounded annually) at the rate of 12 p.c.p.a., what is the difference between interests earned by Gautam and Rudra from scheme O after 2 years ?

If scheme P offers compound interest (compounded half yearly) at the rate of 16 p.c.p.a, what would be sum of interests earned by Gautam and Rudra from scheme P after one year ?

What is the respective ratio between the total amount invested by Gautham in scheme O and Q together and the total amount invested by Rudra in the same scheme together ?

Scheme M offers simple interest at a certain rate of interest (p.c.p.a.). If the difference between the interests earned by Gautam and Rudra from scheme M after 4 years is INR 4436.520, what is the rate of interest (p.c.p.a) ?