Please explain so i can see the steps. its 2 questions total

Mannisto Inc. uses the FIFO inventory cost flow assumption. In a year of rising costs and prices, the firm reported net income of $255,987 and average assets of $1,412,450. If Mannisto had used the LIFO cost flow assumption in the same year, its cost of goods sold would have been $35,110 more than under FIFO, and its average assets would have been $31,140 less than under FIFO. Required: a. Calculate the firm's ROI under each cost flow assumption (FIFO and LIFO). (Enter your answers as percentages rounded to 1 decimal place (i.e., 12.2%).) FIFO L IFO ROI % b. Suppose that two years later costs and prices were falling. Under FIFO, net income and average assets were $309,857 and $1,743,120, respectively. If LIFO had been used through the years, inventory values would have been $44,820 less than under FIFO, and current year cost of goods sold would have been $24,396 less than under FIFO. Calculate the firm's ROI under each cost flow assumption (FIFO and LIFO). (Enter your answers as percentages rounded to 1 decimal place (i.e., 12.2%).) FIFO LIFO ROI