Answer:
Store A = 3.4521
Store B = 2.9589
Store C = 4.4384
Explanation:
Store A charges ADB method
purchase made on 5th first payment on 15th of 100
so from 5th to 15th Average daily balance =300 for 10 days
then from 15th to 4th for remaining 20 days average daily balance = 200
Average Daily Balance = (300*10+200*20)/30
Total finance charge = ADB*(APR*(Days/365))
=300*((0.18)*(10/365))+200*((0.18)*(20/365))
= 1.4795+1.9726=3.4521
Store B
Adjusted Balance Method uses adjusted balance to calculate the charges
Adjusted balance=Starting balance adjusted for credit and debit
Adjusted balance =300-100=200
Financial Charges = 200*(.18*(30/365))=2.9589
Store C
Previous Balance Method the interest is calculated on amount of balance carried from previous billing cycle
Balance Carried = 300
Charges =300*(.18*(30/365))= 4.4384