Calculate the concentration of the diluted sample when the concentration of prepared standers is 0.1 , 0.2 , 0.3 , 0.4 , 0.5 mg/ml and the absorbance is 0.2 , 0.4 ,0.6 , 0.8 , 1.2 and the absorbance of the sample was 0.5 ? *

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