(WSVN) - She bought a used car without understanding the financing agreement. When her first car payment came in — she realized it takes up her entire monthly paycheck. Can she get out of the deal?

Here's why some car buyers live by the 20% rule when purchasing a new vehicle and how you can use it to your advantage.

In the midst of rising car prices and interest ... which means you've broken the contract," says Gelinas. "This is usually in the range of 30 to 90 days of non-payment, depending on state laws ...

A principal-only car payment is an extra ... review your loan contract or reach out to customer support to determine how additional payments are applied. What is the principal of a loan?