The solution of the problem 3.59 cr 3 from the problem

The solution of the problem 3.59 cr 3 from the problem

Task 3.59
How many times will the intensity of monochromatic light change when passing through two layers of an absorber 20 and 10 cm thick having linear absorption coefficients of 0.05 cm-1 and 0.2 cm-1, respectively.