Explain what was the concentration of cu^2+ in the original

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Exactly 10.0 mL sample of Cu^2+ gave an absorbance of 0.262 AU. When 2.00 mL of a 5.0 ppm Cu^2+ solution was added to the above Cu^2+ sample solution, the new absorbance was found to be 0.324 AU. What was the concentration of Cu^2+ in the original 10.0 mL solution

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