Mannisto Inc. uses the FIFO inventory cost flow assumption. In a year of rising costs and prices, the firm reported net income of $227,936 and average assets of $1,410,000. If Mannisto had used the LIFO cost flow assumption in the same year, its cost of goods sold would have been $43,260 more than under FIFO, and its average assets would have been $43,930 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 LIFO ROI % % b. Suppose that two years later costs and prices were falling. Under FIFO, net income and average assets were $267,576 and $1,730,000, respectively. If LIFO had been used through the years, inventory values would have been $47,320 less than under FIFO, and current year cost of goods sold would have been $17,111 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 % %