Correct Answer - Option 3 : 4 : 5

**Given:**

Ratio of the rates of Simple Interests in two banks A and B = 5 : 4

Half-yearly interests from both the banks are equal.

**Formula Used:**

Simple Interest (SI) = (P × R × T)/100;

where P = principal, R = Rate of Interest, T = Time period.

**Calculation:**

Let the principal amounts invested in banks A and B be A and B, respectively.

Let the respective rates of simple interest for banks A and B be 5x and 4x

Using the formula for SI, we get:

SI for bank A = (A × 5x × 0.5)/100

Also, SI for bank B = (B × 4x × 0.5)/100

Since the SI is the same for both the banks, we get:

(A × 5x × 0.5)/100 = (B × 4x × 0.5)/100

⇒ 2.5A = 2B

⇒ A/B = 4/5

**∴ The ratio in which deposit should be made in the banks A and B should be 4 : 5**