The bank where Hilary maintains her checking account mistakenly deducted

$16 each month from her account for 8 months and $19 a month for the

next 5 months. The bank realized and corrected the error after 13 months.

How much money does the bank need to return Hilary's account?

The bank owes Hilary $223.

You can find the answer by multiplying $16 by 8, to find how much money the bank mistakenly charged Hilary for eight months.

Then, multiply $19 by 5, to find how much money the bank mistakenly charged Hilary for 5 months.

To find the total amount that the bank charged Hilary in the total 13 months, add the sums from both equations.

$16*8 = $128.

$19*5 = $95.

$128 + $95 = $223.