Identify if it is retrospective or prospective

Identifying Accounting Changes Consider the following independent events. Indicate the type of accounting change represented and the effect on the financial statements of the change. a. Changed from the LIFO to the FIFO inventory cost flow assumption Wrote off (reduced value) of a patent due to the introduction of a competing product b. c. Changed accounting policy of not accruing interest on a notes payable to accruing interest as time passes. d. Increased the Allowance for Doubtful Accounts from 2% of credit sales to 4% of credit sales e. Changed from Straight line to double-declining-balance method of depreciation