Prepare journal entries for transactions below:

a) Equipment with an original cost of $60,000 and accumulated depreciation of $50,000 was deemed unusable and was sold for $500 scrap value.

b) Regular machine maintenace was carried out for $22,000.

c) A major overhaul was done on heavy machinery for a cost of $75,000. This overhaul is expected to be completed every five years.