If the rate of simple interest in percent per annum increases to `12(1)/(2)%` from `10%`, the income of a person increases to `Rs1250` . Find the principal .

If the rate of simple interest per annum decreases from 4% to 3(3)/(4)% , then the yearly income of a person decreases by 60Rs . Find the principal of that person.

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.

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 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 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.

The simple interest of a principal increases by Rs42.50 when the rate of simple interest per annum increases from 7% to 7(1)/(2)% . Find the principal.

The rate of simple interest per annum reduces from 4% to 3 3/4% and for this, a person's annual income decreases by ₨. 60. Determine the principal of that person.

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

What is the rate of simple interest in percent per annum if the total interest of Rs 73,000 for 1 day is 50 paisa?

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.