Explain why service companies use different activity bases than manufacturing companies to classify costs as fixed or variable. Light Company has the following information for January: Determine (a)...

Explain why service companies use different activity bases than manufacturing companies to classify costs as fixed or variable.

Light Company has the following information for January:

Determine (a) the manufacturing margin, (b) the contribution margin, and (c) income from operations for Light Company for the month of January.