The federal tax rate for heads of household is given in the graph shown to the right. Use the graph to find lim r(x), lim r(x), and lim r(x). 18.00- x-+8740 - x-+8740+ X-+8740 Find lim r(x). Select the correct choice below and, if necessary, fill in the answer box to complete your 12.00- x-+8740 - choice. Tax rate (percentage) 6.00- A. lim r(x) = 6% X-+8740 - (Simplify your answer. Do not include the % symbol in your answer.) 0.00- ..... O B. The limit does not exist. 8740 35369 89110 Taxable income (in dollars) Find lim r(x). Select the correct choice below and, if necessary, fill in the answer box to complete your x-+8740* choice OA. lim r(x) = 1% x-+8740+ (Simplify your answer. Do not include the % symbol in your answer.) O B. The limit does not exist