Answer:
<h2>
The interest ethan will pay is $164.25</h2>
Step-by-step explanation:
To calculate the interest paid by ethan on the borrowed bike using the formula.
Simple Interest = Principal * rate * time/100
Principal = $2,190, rate = 2.5%, time = 3years
On substitution
SI = 

The interest ethan will pay is $164.25
The diameter would be twice 5, or 10
1.75 hours, add them up and divide by two and you get your answer