Aptitude - Simple Interest

Find simple interest if Rs. 100 is invested at 10% p.a. for 3 months.

At what rate p.a. simple interest will a sum of money double itself in 16 years?

If Rs. 12,500 amount to Rs. 15,500 in 4 years at R% p.a. simple interest then what is the value of R?

If Rs. 800 becomes Rs. 956 in 3 years at R% p.a. simple interest. So, if the rate is increated by 4% then what will Rs. 800 become in 3 years?

In how many years Rs. 150 will produce the same interest at 8% p.a. as Rs. 800 produce in 3 years at 4.5% p.a.?

Monty borrowed X amount of money from the bank at 6% p.a. for the first 3 years, 9% p.a. for the next 5 years and 13% p.a. for beyond 8 years. If we paid total INR 8160 as interest at the end of 11 years then what was the amount he borrowed?

If a sum of money at simple interest amounts to $815 and $854 in 3 and 4 years respectively then what was the amount that was invested?

If a sum of money amounts to INR 9800 and INR 12005 after 5 and 8 years respectively at the same rate of simple interest then, find the interest rate per annum.

At what rate of interest will a sum of money double itself in 12 years?

In how many years would the simple interest on certain sum be 0.125 times the principal at 10% p.a.?