If at the rate of simple interest in percent per annum by which a principal becomes double in `20` years and also amounts to `7Rs20` after `4` years, then find the principal.

At the same rate of simple interest in percent per annum, if a principal becomes are amount of Rs 7100 in 7 yrs and of Rs 6200 in 4 yrs, then find the principal and rate of simple interest in percent per annum.

At the same rat of simple interest in present per annum, if a principle becosmes the amount of ₹ 7400 in 8 years and of ₹ 6200 in 4 years, then determine the principal and rate of simple intest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of Rs 1248 in 7 years and or Rs 1056 in 4 years. Find the principal and rate of simple interest in percent per annum.

At the same rate of simple interest in percent per annum, if a principal becomes the amount of 7100Rs in 7 years and of 6200Rs in 4 years. Determine the principal and rate of simple interest in percent per annum.

Find the rate of simple interest in percent per annum, if a principal becomes (4)/(9) part of its amount in a period of time of 20 years.

At what rate of simple interest in percent per annum, the ratio of principal and its interest after 20 years is 1:1 ?

Find the rate of simple interest in percent per annum if the simple interest of a principal is 3/5 part of the amount in 10 years.

At what rate of simple interest per annum in percent the interest of a principal in 20 years will be (4)/(9) part of its amount ?

The simple interest of a principal in 1 year and 9 months at the rate of simple interest of 5% per annum is 63Rs more than of the same principal in 2 years and 4 months at the rate of simple interest of 4(1)/(2)% per annum. Find the principal.

If a principal becomes dublein 10 years. Then the rate of simple interest in prescent per annum will be