Answer:
gh280,854
Explanation:
You want the total income after 3 and half years of a man and a woman who receive a monthly salary of gh3725 and gh2962 respectively.
Total
You can add up the income from each of the months for each of them, or you can use multiplication to simplify the problem.
The total income each month is ...
gh3725 +gh2962 = gh6687
The total received in 42 months is ...
42 × gh6687 = gh280,854
Their total income after 3 1/2 years is gh280,854.
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Additional comment
There are 12 months in a year, so ...
3×12 +1/2×12 = 36 +6 = 42
months in 3 1/2 years.