The simple interest received after 2 years on Rs (x + 800) at the rate of 20% p.a is Rs (2x – 1800). The amount received on Rs 4x when invested at 50% p.a compound interest, compounded annually for 2 years can be:

According to the question,

{(x + 800) × 2 × 20}/100 = (2x – 1800)

=> 2x + 1600 = 10x – 9000

=> 8x = 10600

=> x = 1325

Therefore, required amount received = 4x . (1 + 50/100)^{2} = Rs. 11925

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- Rs. 8800 is invested in scheme ‘A’ for a year at simple interest of 20% p.a. The interest received from scheme ‘A’ is reinvested for 2 years in scheme ‘B’ which offers compound interest (compounded annually) of 40% p.a. What is the total amount received from scheme ‘B’?
- Akshay invested Rs. 960 in two schemes P and Q in the respective ratio of 5:3. Scheme P and Q are offering simple interest at the rate of 7% per annum and 10% per annum, respectively. Find the interest obtained after 2 years from scheme P.
- A man invested certain sum at simple interest of r% p.a. such that it amounts to 124% of itself in 10 years. Find the interest earned when Rs. 10000 is invested at simple interest of r% p.a. for 3 years.
- The simple interest received on a certain sum is Rs. 250 less than the sum invested. If the sum was invested at 15% p.a. for 4 years, then find the simple interest received.
- Veeru invested Rs. 3100 at 20% p.a. simple interest for 3 years. After 3 years, he invested the amount received by him at the 20% p.a. compound interest, compounded annually for another 2 years. Find the final amount received by Veeru at the end of 5 years.
- Vipul invested Rs.4000 at the rate of R% simple interest for four years and he got Rs.1600 as interest. If he invest same amount for 2 years in C.I. and rate of interest increased by 4%, then find the interest received by Vipul after 2 years.
- Simple interest and compound interest (compounded annually) earned on a sum at the end of 2 years at a certain rate of interest p.a. are Rs. 2500 and Rs. 2800 respectively. Find the rate of interest.
- 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.

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