Answer:
0.067 or 6.7%
Explanation:
Given;
Principal = $2300
interest = $138
Service charge = $15
Therefore to find APR, we use the formula:
APR=Finance charge/Principal
To find finance charge we use
Finance charge (FC) = interest + service charge(SC)
= $138 + $15
= $153
Therefore
APR = Finance charge / Principal
= $153 / $2300
= 0.067 or 6.7%