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The following graph shows the percentage of U.S. residents who used the Internet at home in 2010 as a function of income (the data points) and a logistic model of these data (the curve). 100 U.S. Residents using Internet (6) 0 20 40 60 80 100 120 140 Household income ($1,000) The logistic model is given by P(x) = - 86.2 1 + 2.49(1.054)-x percent where x is the household income in thousands of dollars. (a) According to the model, what percentage of extremely wealthy people used the Internet at home? (Round your answer to one decimal place.) (b) For low incomes, the logistic model is approximately exponential. Which exponential model best approximates P(x) for small x? (Round numeric values to four significant digits.) P(x) = (c) According to the logistic model, 50% of individuals with what household income used the Internet at home in 2010? (Round the answer to the nearest $1,000.) $