Based on the information given her total cost of credit is $69.
Total cost of credit
Using this formula
Total cost of credit =(Amount borrowed×APR)+Annual service
Where:
Amount borrowed=$300
APR=21%
Annual service=$6
Let plug in the formula
Total cost of credit=($300×21%)+$6
Total cost of credit =$63+$6
Total cost of credit=$69
Inconclusions her total cost of credit is $69.
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