For each of the following events, indicate the type of change and the proper accounting treatment (retrospective or prospective).

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Event Type of Change Accounting Method Change in the useful life for a plant asset Change in accounting for long-term contracts Adoption of the FIFO method for a new product line Change from the average-cost method to the LIFO method Change from the straight-line method to the declining-balance method Switching to an aging of accounting receivables to compute bad debt expense and the allowance for bad debts instead of using a percent of sales