Unfortunately, The alternator of my car has gone. The garage replaced it with a rebuilding one and charge me 280+tax. Is this price reasonable? Oh, My car is a 1990 Corolla
Even not reasonable, do you have a choice? Next time buy a used one in any used parts store ($10-30 with 30 day warrant), then find a small garage to install it. You may need just $80. That is for a car over 10 years old.