A customer has a balance of $1,350. Interest is paid at the end of 12 months. Assuming the balance remains at $1,350 for all 12 months, how much interest will be earned after 12 months if the interest rate on the account is 5.5%?

looks like a "simple interest" case

I = 1350 * .055 * 1 = .....

74.25

To calculate the interest earned after 12 months, you'll need to multiply the balance by the interest rate.

The formula to calculate interest is:

Interest = Balance * Interest Rate

In this case, the balance is $1,350 and the interest rate is 5.5%.

So, to calculate the interest earned after 12 months, you would use the following formula:

Interest = $1,350 * 0.055

Multiply $1,350 by 0.055:

Interest = $74.25

Therefore, the customer will earn $74.25 in interest after 12 months if the interest rate on the account is 5.5%.