What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wave

Question

If a 0.060 M sample of Co(N03)2 gave an absorbance of 0.29 at 500 nm in a 1 cm cell. What is the cobalt concentration of a solution giving and absorbance of 0.14 in the same cell at the same wavelength

Answer 1

Proportional!
(cobalt concentration which gives an absorbance of 0.14) /0.060M = 0.14/0.29