4-35 Proration of overhead. The Row-0n-Watershed Company (ROW) produces a line of non-motorized boats. RDW uses a normal-costing system and allocates manufacturing overthead using direct manufacturing labor cost. The folowing data are for 2020: Inventory balances on December 31, 2020, were as follows: 1. Calculate the manufacturing overhead allocation rate. 2. Compute the amount of under- or overallocated manufacturing overhead. 3. Calculate the ending balances in work in process, finished goods, and cost of goods sold if under- of overellocated menufacturing overhead is as follow: a. Written off to cost of goods sold b. Prorated based on ending balances (before prorationl in each of the three accounts c. Prorated based on the overhead allocated in 2020 in the ending balances (before proration) in wach of the three accourts 4. Which method would you choose? Justily your