Define variables and the objective function.

Let $x$ be the number of cars.
Let $y$ be the number of lorries.
The objective is to maximize the income, $P$.
The parking charge for a car is $\text{UGX } 4,000$.
The parking charge for a lorry is $\text{UGX } 20,000$.
The objective function is:

1. Space constraint: Each car requires $10 \, \text{m}^2$. Each lorry requires $30 , m^