Answer:
a-1. Strictly considering tax factors, should Nitai work or repair his car if the $420 he must pay to have his car fixed is not deductible?
a-2. Given the answer in a-1 above, by how much is Nitai better or worse off?
Explanation:
additional revenue generated by working on weekend = $525 x (1 - 12%) = $462
cost of repairing the car at Autofix = $420
net benefit of working during the weekend = additional revenue - cost of repairing the car at Autofix = $462 - $420 = $42