Kisiwaa saved 1/4 of their salary and paid 1/2 of the remainder to their sister. If they had $300 left, what was their original salary?

Step 1: Solve Question 1.

a) Calculate Kisiwaa's total salary.
Let $S$ be Kisiwaa's total salary.
Amount saved = $\frac{1}{4}S$.
Remaining money after saving = $S - \frac{1}{4}S = \frac{3}{4}S$.
Amount paid to sister = $\frac{1}{2}$ of the remaining money = $\frac{1}{2} \times \frac{3}{4}S = \frac{3}{8}S$.
Amount left = Remaining money - Amount paid to sister = $\frac{3}{4}S - \frac{3}{8}S = \frac{6}{8}S - \frac