They have old equipment that cost $56,210. The equipment has accumulated depreciation of $27,360 and a fair value of $33,380. They have decided to sell the equipment.

You have to write the asset out of the books, record the cash receipt, and account for the gain/loss on disposal. Using a disposal account will help you keep track of things:

Dr: Disposal A/c - $56,210
Cr: Asset A/c - $56,210

This writes out the asset

Dr: Accumulated Dep'n - $27,360
Cr: Disposal A/c - $27,360

This writes out the accumulated dep'n

Dr: Bank Account - $33,380
Cr: Disposal A/c - $33,380

This records the cash received

Dr: Disposal Account - $4530*
Cr: P&L - Gain on disposal $4530

This records the gain/loss on disposal

* this is the balance on the disposal account which represents the gain or loss on disposal. It's a gain in this case as the asset sold for $33,380 and its book value was $28,850 ($56,210 - $27,360)

DR Cash 33,380.00
DR Acc dep 27,360.00
CR Gain on disposal 4,530.00
CR Asset 56,210.00