Final answer:
The rate of interest at which Rs 4,000 becomes Rs 6,000 in 2 years is 25% per annum.
Step-by-step explanation:
The question asks to find the rate of interest at which an amount of Rs 4,000 becomes Rs 6,000 in 2 years. This problem involves simple interest, which can be calculated using the formula: Interest = Principal × Rate × Time. The Interest here is Rs 6,000 - Rs 4,000 = Rs 2,000, the Principal is Rs 4,000, and the Time is 2 years. To find the rate, rearrange the formula to solve for Rate (R): R = Interest / (Principal × Time).
R = Rs 2,000 / (Rs 4,000 × 2 years) = 0.25 or 25%
The rate of interest required for Rs 4,000 to grow to Rs 6,000 in 2 years is 25% per annum.