- 0.375%
- 0.25%
- 1.25%
- 0.425%

Option 1 : 0.375%

**Given:**

The difference between the interest received by A and B is Rs.36 on Rs.2400 for 4 years.

**Concept used:**

Simple interest

**Calculation:**

Simple interest = \(\frac{{{\rm{Principal}} \times {\rm{Rate}} \times {\rm{Time}}}}{{100}}\)

Here difference in rate can be written as R_{1} - R_{2}

⇒ \(36 = \frac{{2400\ \times\ 4\ \times\ {R_1} - {R_2}}}{{100}}\)

R1 - R_{2} = \(\frac{{36\ \times\ 100}}{{2400\ \times\ 4}}\)

R_{1} - R_{2} = 9/24 = 0.375%

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