Respuesta :
2.5 years = 30 months
7500$ in 30 months
x$ in 1 month
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x = (7500*1)/30 = 250
The answer is 250$/month.
Earning in 2.5 years = $7500
1 year = 12 months
2.5 years = 2.5 ⋅ 12 = 30 months
Then, earning in 30 months = $7500
Therefore, earning in 1 month = 7500/30 = $250
The unit rate of his earning per month is $250.