0.4 g sample of hair from a young child is digested in a mixture of HNO, and and diluted to 25 mL. A 10 mL aliquot is diluted to 25 mL and analysed with a ca hollow cathode tube in AAS. The absorbance reading is 0.13. To a second 10 mL is added 1.00 mL of a 0.40 ppm standard cadmium solution, followed by dilution to and analysis for cadmium. The absorbance reading is 0.18. Calculate cadmium con the above hair sample in µg/mL.