To find the interest rate, we first need to calculate the interest earned on the principal amount. The interest earned is the difference between the amount and the principal.

Interest = Amount - Principal
Interest = Rs. 896 - Rs. 799.9999999999999
Interest = Rs. 96.0000000000001 (rounded to Rs. 96 for simplicity)

Now, we need to find the interest rate per year. Since the interest is earned over 2 2/5 years, we can convert that to a decimal for easier calculation:

2 2/5 years = 2 + (2/5) years
2 2/5 years = 2 + 0.4 years
2 2/5 years = 2.4 years

The formula to calculate the interest rate (R) per year is:

Interest = Principal * Rate * Time

We can rearrange this formula to solve for the rate:

Rate = Interest / (Principal * Time)

Plugging in the values we have:

Rate = Rs. 96 / (Rs. 799.9999999999999 * 2.4)

To avoid any potential rounding errors, let's use the exact value of the principal in the calculation:

Rate = 96 / (799.9999999999999 * 2.4)

Now, let's calculate the rate:

Rate = 96 / 1919.9999999999998
Rate ≈ 0.05000000000000002

To express the rate as a percentage, we multiply by 100:

Rate ≈ 0.05000000000000002 * 100
Rate ≈ 5.000000000000002%

So, the interest rate is approximately 5% per year.
이자율을 찾으려면 먼저 원금에 대한 이자를 계산해야 합니다. 이자는 금액과 원금의 차이입니다.

이자 = 금액 - 원금
이자 = 896 - 799.9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999