An administrative secretary earns $15 per hour up to 40 hours in a week. The time that the admin works over 40 hours in a week is paid at time and a half. What is the piecewise-defined function that models the total weekly earnings for X hours of work? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. b c P f(x) = { f(x) = { f(x) = { f(x) = { 15x, if 0 x 40 15x+22.5x, if x > 40 15x, if 0 x 40 15x+22.5(x-40), if x > 40 15x. if 0 x 40 600+22.5x, if x 40 15x, if 0 x40 600+22.5(x-40), if x > 40