The Capital portion of the loan that will be paid in the next financial year will increase by R15 000.

The balance on 01 March 2024, plus the interest for the year, minus the repayments, should equal the balance on 28 February 2025.
Let $x$ be the interest for the year.

$$380\,000 + x - 78\,000 = 330\,000$$

Combine the known values on the left side.

$$302\,000 + x = 330\,000$$

Subtract $302\,000$ from both sides of the equation.

$$x = 330\,000 - 302\,000$$ $$x = 28\,000$$

The interest for the year is R28 000.

The interest for the year is:

$$\text{R}28\,000$$