137. Solving a chemistry problem

To determine palladium by the method of two standards, a weighed portion of a sample weighing 1.0000 g after decomposition and appropriate processing was transferred into a solution with a volume of 10.0 ml. An aliquot of the resulting solution with a volume of 100.0 μL was placed in an electrothermal atomizer of an atomic absorption spectrophotometer and the absorption signal was recorded in the form of a peak 28.0 mm high. Aliquots of 100.0 μL of standard solutions of palladium with concentrations of 0.0100 and 0.0500 μg / mL under the same conditions gave peaks with heights of 8.5 and 45.0 mm. Calculate the mass fraction (%) of palladium in the analyzed sample.