老师请解释一下怎么算的？

samliang

A company manufactures a single product which it sells for ￡15 per unit. The product has a contribution to sales ratio
of 40%. The company’s weekly break-even point is sales of ￡18,000.
What would be the profit in a week when 1,500 units are sold?
A ￡900
B ￡1,800
C ￡2,700
D ￡4,500