Activiy-lasied Costing and Conventionul Costs Compared ds acount stores. Following is informstion pertaining to the manuf acturing costs for the current month. Manufacturing owethead follom: HINT Uhe a.470s for overhead rate catculations. (b) Dobermine the tokal and per-unit costs of manafacturing the Gas Cooker and Charcosi Smoker for the month, assuming manufacturing overtiaxd is assigned using activity-hased costing