Expenses are apportioned in the ratio 2:3 for departments M and N respectively. What is N’s share of the expense?

A company has departments M and N. The expenses incurred wholly in M is N5000. General expenses incurred amount toN25000. Expenses are apportioned in the ratio 2:3 for departments M and N respectively.
What is N’s share of the expense?

A N10 000

B N15 000

C N18 000

D N20 000

Answer is B