To determine how much of the final amount was a result of earned interest, we first need to calculate the total contributions made by Donovan over the 10 years.
Donovan contributes $75 per month for 10 years, so the total number of months is:
\[ 10 \text{ years} \times 12 \text{ months/year} = 120 \text{ months} \]
Next, we calculate the total contributions:
\[ \text{Total Contributions} = 75 \text{ dollars/month} \times 120 \text{ months} = 9000 \text{ dollars} \]
The future value of the account after 10 years is given as $9703.52. Now, we can find how much of the final amount is due to earned interest by subtracting the total contributions from the future value:
\[ \text{Earned Interest} = \text{Future Value} - \text{Total Contributions} \] \[ \text{Earned Interest} = 9703.52 - 9000 = 703.52 \]
Thus, the amount of the final account that was a result of earned interest is:
\[ \boxed{703.52} \]
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