Tire repair for each tire costs $7, plus another 50 cents for sales tax. If Juan needs all 4 tires repaired, how much is the final cost?
A step-by-step solution is:
30
Juan pays 4 * 7 = 28 dollars for all four tire repairs.

Juan pays 0.

50 * 4 = 2 dollars in sales tax for all four tire repairs.

Juan pays a total of 28 + 2 = 30 dollars.

.

The final answer: 30