Willis Bus Service traded in a used bus for a new one. The original cost of the old bus was $50,700. Accumulated depreciation at the time of the trade-in amounted to $35,900. The new bus cost $75,500 but Willis was given a trade-in allowance of $10,600. a. What amount of cash did Willis have to pay to acquire the new bus? b. Compute the gain or loss on the disposal for financial reporting purposes