Arithmetic

Simple & Compound Interest

Easy

A sum of money at compound interest double itself in 12 years. It will become 16 times of itself in:

38 years

35 years

48 years

45 years

✅ Correct Option: 3

Under compound interest the amount grows geometrically, so doubling repeats over equal time blocks. Since $16 = 2^4$ , the sum must double four times.

Time required $= 4 \times 12 = 48$ years.

2023: 21 May Shift 1

What sum of money will amount to Rs. 520 in 5 years and to Rs 568 in 7 years on simple interest?

2024

A certain sum becomes ₹ 2,356 in 3 years and ₹ 2,660 in 5 years on simple interest. The value of sum is:

2023: 28 May Shift 1

If Rs 64 amounts to Rs 83.20 in 2 years on simple interest, then how much will Rs 86 amount to in 4 years at the same rate percent per annum ?

2026: 24 May Shift 1

At what rate of compound interest per annum, a sum of Rs 1800 becomes Rs 2178 in two years?

2026: 26 May Shift 1

Simple interest on a certain sum of money for 3 years at 8% per annum is half of the compound interest on ₹ 6000 for 2 years at 10% per annum. Find the sum on which simple interest is calculated ?

2025: 16 May Shift 1

The simple interest on a certain sum of money at 5% per annum for 4 years and 3 years differs by Rs. 42. What is the sum?

A sum of money at compound interest double itself in 12 years. It will become 16 times of itself in:

Solution

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