A sample of soluble salt weighs 1.2 g and contains chloride, bromide and iodide. With AgNO3, a precipitate is obtained which weighs 0.4500 g. On heating this precipitate with Cl2 gas, the AgBr and AgI are converted to AgCl, and the precipitate then weighs 0.3300 g. A similar sample, when treated with palladous chloride, precipitates only PdI2, and this precipitate weighs 0.0900 grams. (*)Find the approximate percentage of chlorine, bromine and iodine in the sample

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