How do I find the total interest paid in dollars on a loan with the interest rate, total amount of years, and principle amount?

(what is the equation, because I tried and kept getting $363750.0)

JGRASP Messages Run I/O Interactions ---- GRASP exec: python Labo1v1a Enter principal 250000 Enter annual rate 4.85 Enter number of years 30 Principal: $ 250000 Annual Rate: 4.85 % Number of Years: 30 Monthly Payment: $ 1319.23 Total Payments: $ 474922.8 Total Interest: $ 224922.8 ---GRASP: operation complete. L