A) Find the total investment returns accumulated over the first 12 months.

Here's a step-by-step solution to the problem:

a) Find the total investment returns accumulated over the first 12 months.
The monthly returns follow an Arithmetic Progression (AP).
Let $a_n$ be the return in the $n$-th month and $d$ be the common difference.
The return in the 4th month is $a_4 = \text{UGX } 2,800,000$.
The return in the 10th month is $a_{10} = \text{UGX } 5,200,000$.

Step 1: Find the common difference $d$ and the first term $a_1$.
For an AP, $a