Calculate the exact number of days

Identify that 2024 is a leap year, so February has 29 days and the year has 366 days.

• Days in February (from 12th Feb): $29 - 12 = 17 \text{ days}$
• Days in March: $31 \text{ days}$
• Days in April: $13 \text{ days}$ Total days = $17 + 31 + 13 = 61 \text{ days}$.

$\text{Total Days} = 61 \text{ days}$

Convert days into years

Since 2024 is a leap year, total days in the year = 366 days. Time period $T = \frac{61}{366} \text{ years} = \frac{1}{6} \text{ year}$.

$T = \frac{1}{6} \text{ year}$

Apply Simple Interest Formula

Using $SI = \frac{P \times R \times T}{100}$ with $P = 4000$, $R = 5.25\%$, and $T = \frac{1}{6}$ year: $SI = \frac{4000 \times 5.25 \times 1}{100 \times 6}$

$SI = \frac{4000 \times 5.25 \times 1}{600}$

Perform Calculation

Simplify the fraction: $SI = \frac{4000}{600} \times 5.25 = \frac{20}{3} \times 5.25 = 20 \times 1.75 = ₹35$

$SI = ₹35$