To calculate the income earned in one month on the checking account, we can start by calculating the interest earned based on the account balance.
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Interest earned from the account:
- The monthly interest rate is 0.75%.
- The account balance is $1,000.
\[ \text{Interest earned} = \text{Account balance} \times \text{Monthly interest rate} \] \[ \text{Interest earned} = 1000 \times 0.0075 = 7.5 \]
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Monthly financial charge:
- There is a $2.00 financial charge.
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Income earned in one month: \[ \text{Net income} = \text{Interest earned} - \text{Financial charge} \] \[ \text{Net income} = 7.5 - 2.0 = 5.5 \]
Thus, the income earned in one month on the checking account for a customer with an account balance of $1,000 is $5.50.
So the correct answer is $5.50.