Answer:
$12.68
Step-by-step explanation:
Interest is calculated using the formula below. As the consideration for this question is a single month, compounding interest does not need to be considered:

where I is interest, P is the principal amount, r is the interest rate and t is the time of investment
APR is converted to monthly interest rate by dividing by 12 (for the number of months).
P = $ 845
r = 18% annually = 1.5% monthly
t = 1 month




