29. Solving a chemistry problem

2. The absorption coefficient of components A and B in solution at λ=540 nm is ελ(A)=574 l/mol*cm, ελ(B)=574 l/mol*cm, respectively. The optical density of a solution containing both of these components turned out to be 0.360 at λ=540, L=1 cm. What is the concentration of B in this solution if [A]=5.00*10-4 mol/l.