For paying your credit card bill on time on a consistent basis, your bank rewarded you anddecreased your credit card APR by 4%. However after a few months, you forgot to pay your bills and they raised your current credit card APR by 4%. You thought that the -4% +4% was a 0% change but it wasn't. By what did your bank actually increase/decreaseyour credit card APR by? (Show all work and round your percent to 2 decimal places.)
having a hard time could someone help me out?
4% down leaves you at 0.96 of the starting rate.
then 4% up gives you 1.04 * 0.96 = 0.9984 of the starting rate.
so you actually wind up with a 0.16% lower rate