Can you please help me answer the following question?

Thank you!!

Below is the net income of Anita Ferreri Instrument Co., a private corporation, computed under the three inventory methods using a periodic system. Assume that in 2015 Ferreri decided to change from the FIFO method to the average-cost method of pricing inventories. Prepare the journal entry necessary for the change that took place during 2015, and show net income reported for 2012, 2013, 2014, and 2015. Assume that in 2015 Ferreri, which had been using the LIFO method since incorporation in 2012, changed to the FIFO method of pricing inventories. Prepare the journal entry necessary to record the change in 2015 and show net income reported for 2012, 2013, 2014, and 2015