$1.$ Using a plantwide overhead rate based on $3,250$ direct labor hours, compute the total product cost per unit for each product.

$2.$ Consider the following additional information about these two products. If activity$-$based costing is used to allocate overhead cost, $($a$)$ compute overhead activity rates, $($b$)$ allocate overhead cost to Product A and Product B and compute overhead cost per unit for each, and $($c$)$ compute product cost per unit for each.