Katherine Company manufactures special machines according to customers' specifications. The following data were available at the beginning and ending of April:

Beginning

Ending

Materials inventory

P32,400

P34,000

Work in process inventory

7,200

16,240

Finished goods inventory

8,000

6,000

During April, direct materials costing P40,000 were purchased, direct labor cost totaled P33,000, and factory overhead was P17,160. For April, cost of goods manufactured is:

a.

P90,560

b.

81,520

c.

79,520

d.

88,560