[" 2.A sum of money at a certain rate per "],[" annum of simple interest doubles in "],[5" years and at a different rate triples "],[" in "12" years.The lower rate of interest "],[" per annum is "]

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

If a sum of money at simple interest doubles in 12 years, the rate of interest per annum is

At what rate per cent per annum simple interest will a sum double itself in 8 years ?

If the principal is double in ten years, then the rate of simple interest per annum is

At what rate per cent per annum simple interest will a sum double itself in 10 years?

At what rate per cent per annum simple interest will a sum double itself in 10 years?

At r% per annum a sum doubles after 20 years . The rate of interest per annum is :

At a certain rate per annum , the simple interest on a sum of money for one year is Rs.260 and the compound interest on the same sum for two years is Rs. 540.80 . The rate of interest per annum is

If a sum of money at simple interest doubles in 12 yr, then rate oif interest per annum is