What is the rate of simple interest per annum, when the interest of some money in 10 yrs will be `2/5th` part of it amount?

What is the rate of simple interest per annum, when the interest of some money in 2 year will be 1/3 part of its maount ( principal along with interest )?

What is the rate of simple interest per annum, when the interest of some money in 4 years will be 8/25 part of its principal?

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 ?

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?

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.

What will be the compuound interest of Rs. 1000 in 18 months at the rate of 10% compound interest per annum when the interest is compounded at the interval of 6 months?

What will be the compound interest of Rs. 320000 in 1 year at the rate of 20% compound interest per annum when the interest is compounded at the interval of 3 months?

At the rate of compound interest 5% per annum, find the amount of Rs. 80000 in 2 1/2 years.

Ramen obtained simple interest Rs. 1600 by depositing a sum of money in a bank after 4 years at the rate of 4% simple interest per annum. If the same sum of money will be deposited in the bank at the rate of 10% compound interest per annum, then what will be the obtained compound interest?

If the rate of simple interest per annum be 6% , then find the simple interest of Rs 3500 from 5th January 31st March 1954 .