Laden Corporation uses job$-$order costing. At the beginning of the year, it made the following estimates:

Direct labor$-$hours required to support estimated production $105,000.$

Machine$-$ hours reauired to support estimated production $52,500.$

Fixed manufacturing overhead cost $$294,000.$

Vatiable manufacturing overhead cost per direct labor$-$hour $$3\mathrm{.}00$

Variable manufacturing overhead cost per machine$-$hour $$6\mathrm{.}00$

During the year, Job $550$ was started and completed. The following information pertains to this job:

Direct materials $$229$

Direct labor cordt $$293$

Direct labor$-$hours $15$

Machine$-$ hours $5$

Required:

$1.$ Assume Landen has historically used a plantwide predetermined overhead rate with direct labor$-$ hours as the allocation base. Under this approach: a$.$Compute the plantwide predetermined rate.

b$.$ Compute the total manufacturing cost of Job $550.$

c$.$ If Landen uses a markup percentage of $200\%$ of its total manufacturing cost, what selling price would it establish for Job $550?$

$2.$ Assume Landen's controller believes that machine$-$hours is a better allocation base than direct labor$-$hours. Under this approach:

a$.$ Compute the plantwide predetermined overhead rate.

b$.$ Compute the total manufacturing cost of Job $550.$

c$.$ If Landen used a markup percentage of $200\%$ of its total manufacturing cost, what selling price would it establish for Job $550?$