A certain sum of money will be doubled in 25 years at the rate of simple interest percent per annum is:

SI = (P × R × T)/100 Amount, (A) = P + SI Let P be the principal. SI = 2P – P = P ⇒ P = (P × R × T)/100 ⇒ P = (P × R × 25)/100 ⇒ R = 100/25 = 4%

- Shivam invested 24000 at 8% p.a. simple interest for ‘x’ months. If at the end of ‘x’ months, he received a total amount of Rs.27200. What is the value of ‘x’ (in years)?
- The simple interest received on a certain sum is Rs. 500 less than the sum invested. If the sum was invested at 12% p.a. for 8 years, then find the simple interest received.
- Jupiter borrowed a sum of Rs 31,500 from Mars at the rate of 14% per annum for 3 years. He added some more money in it and lent it to Saturn at the rate of 16% for same years to a total profit of Rs 3,090. Find how much amount does he add?
- Simple interest earned on an amount of Rs.1600 at rate of R% per annum after 4 years is Rs.256. Find the simple interest earned on an amount of Rs.1800 at rate of (R + 3)% per annum after 2 years.
- At what % of simple interest per annum will Rs. 600 amount to Rs. 780 in five years?
- A sofa of MRP 2500 is available in Rs.500 cash down payment and 9 monthly equal installment of Rs.250 each. Find the rate of interest per annum.
- A sum of money lent out at simple interest amounts to Rs.620 after 2 years and to Rs.1220 after a further period of 4 years. The sum is:
- Rs. 33000 was partly lent at 5% & remaining at 8% S.I. If total interest received from both was Rs. 6930 in 3 years. Then find the amount kept at 5% S.I p.a.?
- A took a loan of Rs.6980 at simple interest of 25% p.a. and invested the same money in a scheme at simple interest of 35% p.a. Find the profit earned by A at the end of 2 years.
- The compound interest (compounded annually) on Rs 8200 for 2 years at R% p.a is Rs 1722. Had the rate of interest been (R+10)% p.a what would have been the interest on the same sum of money for the same time (2 years)?

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