Mannisto Inc. uses the FIFO inventory cost flow assumption. In a year of rising costs and prices, the firm reported net income of $246,103 and average assets of $1,536,150. If Mannisto had used the LIFO cost flow assumption in the same year, its cost of goods sold would have been $31,650 more than under FIFO, and its average assets would have been $35,170 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 $282,403 and $1,854,900, respectively. If LIFO had been used through the years, inventory values would have been $40,900 less than under FIFO, and current year cost of goods sold would have been $18,904 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 % %