A sample of water from a reservoir was analysed for copper content. The sample was filtered and diluted 10-fold with deionized water. A set of standards was prepared with copper concentrations between 100 and 500 ppm. The standards and the sample were aspirated into an atomic absorption spectrometer and the absorbance was measured at the copper absorption wavelength. The results obtained are given below. Calculate the concentration of copper in the reservoir.

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Concentration/ppm 100 200 300 400 500 Sample Absorbance 0.152 0.388 0.590 0.718 0.865 0.751