We can solve this problem using linear programming. Let's define the variables:

• Let $x$ represent the number of small packages.
• Let $y$ represent the number of large packages.

Constraints:

1. Weight Constraint: The total weight of the packages cannot exceed the truck's capacity of 4200 pounds. $25x + 50y \leq 4200$

2. Volume Constraint: The total volume of the packages cannot exceed the truck's capacity of 480 cubic feet. $3x + 5y \leq 480$

3. Non-Negativity Constraints: The number of packages must be non-negative: $x \geq 0, \quad y \geq 0$

Objective Function:

We want to maximize the revenue, which is given by: $R = 5x + 8y$ Where $5x$ represents the revenue from small packages, and $8y$ represents the revenue from large packages.

Problem Summary:

Maximize $R = 5x + 8y$
Subject to:

25x + 50y &\leq 4200 \\ 3x + 5y &\leq 480 \\ x &\geq 0 \\ y &\geq 0 \end{align*}$$ Next, we solve this system graphically or through linear programming methods (such as the Simplex method). Would you like me to calculate the solution using a specific method?