Retail salesperson

Paid: 25,370

Tax: 25,370 x .17 = 4313

Yearly net pay: 25,370 - 4313 = 21,057

Monthly net pay: 21,057 / 12 = 1,754.75

Monthly car budget: 1,754 x 12% = 210.57

Yearly car budget: 210.57 x 12 = 2,525.84

Total car budget: 2,525.84 x 5years = 12,629

Simple interest:
11,995 + 11,995 x 6% x 5years = 15,593.50

Compound interest:
11,995 x 1 + 6% to the fifth power = 16,052.02

Simple interest is cheaper and better deal