calculate % of cobalt

A 4.97g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500mL in a volumetric flask. Cobalt was determined by treating 25.00mL aliquots ofthis diluted solution as follows:
Reagent voulume
Co(II), 3.00ppm Ligand H2O Absorbance
0.00 20.00 5.00 0.398
5.00 20.00 0.00 0.510
Assume that the Co(II)/ligand chelate obeys Beer's law, and calculate the % of cobalt in the original sample.

Can you please show steps?


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