A certain sum of money at certain rate of interest becomes ₹3420 after 2 years and at same rate after two and a half years becomes ₹3525.Find the rate percent per annum.

A certain sum of money lent at compound interest becomes 7396 in 2 years and 7950.70 in 3 years.Find the rate of interest.

If a sum of money at a certain rate of simple interest per year doubles in 5 years and at a different rate of simple interest per year becomes three times in 12 years, then the difference in the two rates of simple interest per year is

A certain sum of money becomes amoung at the certain rate of interest of CI to Rs. 7350 in 2 years & to Rs. 8575 in 3 years. Find the sum of money & rate of interest.

A certain quantity of money becomes three times in 20 years , then at the same rate of interest in how many years it will become double?

A certain sum becomes doubled in 5 years. Find the rate of interest.

A certain sum of money becomes 3 times of itself in 50years. Find the Rate of interest.

With a given rate of simple interest, the ratio of principal and amount for a certain period of time is 4 : 5. After 3 years, with the same rate of interest, the ratio of the principal and amount becomes 5: 7. The rate of interest per annum is