To find the monthly change in Devon's account after paying for the interest service, we can divide the total amount paid by the number of months.
Devon made payments totaling $936 over 8 months.
So, the monthly payment can be calculated as follows:
\[ \text{Monthly Payment} = \frac{\text{Total Payments}}{\text{Number of Months}} = \frac{936}{8} = 117 \]
Devon paid $117 each month.
To determine the change in Devon's account each month after this payment, we need to know how much income or withdrawal (other than the payment) was involved. If we only consider the monthly payment without additional context about income or other account changes, we can't pinpoint the account change.
If we assume that his account didn't change due to any other factors, then after making the payment of $117, the net change in his account each month will be negative $117. This implies that his account decreased by $117 each month because of the service payment. If there is additional income or changes we need to factor in, please provide that information to clarify the calculation.
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