A single gram of a certain metallic substance has 0.52 gram of copper and 0.26 gram of zinc. The remaining portion of the substance is nickel. Ben estimated that 0.2 gram of nickel is 1 gram of the substance. He used this to estimate the amount of nickel in 35 grams of the substance. Find the result of bens estimation strategy. Then, find the exact amount of nickel in 35 grams of the substance.