Four years ago Hakim borrowed 275 to help pay for new tires for his car. He agreed to pay interest at a simple annual interest rate of 4. How much did Hakim owe at the end of 4 years?

Interest each year is 275 × 4% = 275 × 4/100 = 11
→ total interest over 4 years is 4 x 11 = 44
→ total to repay after 4 years is 275 + 44 = 319