Answer:
A) $12.6 B)He will have earned $92.4 extra.
Step-by-step explanation:
A) Assuming that the $420 is not included when calculating the 12 percent tax, that means the tax that he will pay for the $525 is 12 percent of $105 which is (105 x 12) / 100 = $12.6
B) If Nitai does not work and instead fixes the car himself without spending the $420, he will save that money. But if he works and gets the car fixed at Autofix, he will have earned $92.4 over the weekend and still get his car fixed.
I hope this answer helps.