Mannisto Inc. uses the FIFO inventory cost flow assumption. In a year of rising costs and prices, the firm reported net income of $235,546 and average assets of $1,496,540. If Mannisto had used the LIFO cost flow assumption in the same year, its cost of goods sold would have been $48,370 more than under FIFO, and its average assets would have been $40,460 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 15.71 % % b. Suppose that two years later costs and prices were falling. Under FIFO, net income and average assets were $276,216 and $1,772,280, respectively. If LIFO had been used through the years, inventory values would have been $41,110 less than under FIFO, and current year cost of goods sold would have been $24,019 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 % %