A company charges a fixed fee of Sh 50 plus Sh 20 per kilometer. Calculate the total charge C for k kilometers. Then, calculate the percentage commission if the commission received is Sh 30,000 on tot

Commission received = Sh 30,000
Total sales amount = Sh 600,000

Percentage Commission $= \frac{\text{Commission}}{\text{Total Sales}} \times 100\%$

2. Gradient of a line:

Let $(x_1, y_1) = (4, 5)$ and $(x_2, y_2) = (8, 3)$.

3. Solving simultaneous equations by substitution:
Given equations:

1. $2x - y = 6$
2. $x - y = 1$

From (2): $x = 1 + y$ (Equation 3)

The solution is $\boxed{x=5, y=4}$.

Solving the inequality:
Given the inequality: $-3 < 2x - 5$

The solution is $\boxed{x > 1}$.