Given

Dept A Dept B
Floor space 40m² 60m²
Machine hours 1200 1400
Turnover N36 million N64 million
Labour hours 1000 1400
A joint cost of N 72 million incurred by the two departments was apportioned N30 million to A and N42 million to B. the basis used for apportionment must have been

• A.labour hours
• B.floor space
• C.turnover
• D.machine hours
• E.