7. EX If the annual rate for a credit card is 19%,
what is the daily rate?
8. EX If the daily rate is 0.049%, what is the
annual rate?
9. EX You buy a bluray player for $400 on your
credit card on Jan.5. It appears on your Jan.20
statement in the mail but you don't pay it. The
next statement is Feb.20. Calculate the interest
you'll have to pay if the annual rate is 21%.