Final answer:
Roxanne will have to pay $180 in interest.
Step-by-step explanation:
To calculate the interest Roxanne will have to pay, we can use the formula:
Interest = Principal x Rate x Time
Substituting the given values, we have:
Interest = $3,000 x 0.02 x 3
Interest = $180
Therefore, Roxanne will have to pay $180 in interest.