CLASSIFICATION OF COSTS 28 points The following are some of the costs incurred by a company. Identify them as either: a. Prime costs b. Conversion costs C. Both prime and conversion costs d. Neither prime or conversion costs 15. office supplies expense 16. fabric for making shirts 17. rent expense on factory building 18. salary paid to nursing staff in a hospital emergency room 19. cost of plastic for a toy manufacturer 20. utilities incurred in the factory building 21. paper used for bath tissue production 22. insurance expense on factory equipment 23. depreciation on office equipment 24. depreciation on factory building 25. wages of assembly line personnel 26. factory supplies used 27. wages paid to employees that assemble the airplane 28. utilities incurred in the office