A = P(1 + r)^t is the interest formula
A = 1000(1 + .02)^t
A = 1000(1.02)^t
I'm not sure which of your two answers A or C have the t raised to a power but you need to choose the one with the t raised to a power.
To better give a visual, I drew it out instead.
The attachment is the solution.
$9.47
I just multiplied the total by the refund percentage to get that number. It’s just like finding a tip.
$46.46 for both rooms to have carpet