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Let the brother’s present age be x years. Then, The person’s present age = 4/5 x ⇒ 4x/5 + 10 = 9/10(x + 10) ⇒ 9x/10 – 4x/5 = 10 - 9 5x/50 = 1 x = 10 Brother’s age = 10 years.
A sum of Rs. 9,600 grows to Rs. 12,696 when invested at an annual compound interest rate of 'R%' for 2 years. What is the value of 'R'?
A certain sum of money becomes Rs. 1922 in 1 year and 2900 in 3 years at certain rate of simple interest. Find the sum of money invested.
A certain sum gives the interest equals to 3/5th of the sum when invested for 5 years at simple interest. Find the rate of simple interest.