Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

تمرين 7

John Dugan's revolving credit account has an annual percentage rate of 15%. The previous month's balance was $428.10. During the current month, his purchases and cash advances amounted to $281.15 and his payments and credits totaled $150.00.
a. What is the monthly periodic rate of the account
b. What is the finance charge
c. What is John's new balance