As was widely expected, the Federal Reserve announced a 0.50 percentage point interest rate hike Tuesday, further increasing the costs of credit cards, auto financing and variable-rate loans.

Rate increases aim to slow inflation, but they also boost the cost of borrowing. In the last year, interest rates have jumped by about 3% for credit cards, and have nearly doubled for auto financing and adjustable-rate loans and mortgages. With Tuesday's increase, those costs will rise slightly.