Assume Delph chooses to combine its departmental rates from requirement $1$ into a plantwide predetermined overhead rate based on machine$-$hours.

a$.$ Compute the plantwide predetermined overhead rate.

b$.$ Compute the total manufacturing cost assigned to Job D$-70$ and Job C$-200.$

c$.$ If Delph establishes bid prices that are $150\%$ of total manufacturing costs, what bid prices would it have established for Job D$-70$ and Job C$-200?$

d$.$ What is Delph$$s cost of goods sold for the year?