Captain Kirk has spent his income on coffee and doughnuts in such a manner that after his income was exhausted, his marginal utility from his last coffee was 10 utils and his marginal utility from his last doughnut was 50 utils. Coffee is 75 cents per cup; doughnuts are $1.50 each. a) Has Kirk maximized his total utility? Explain, using the utility-maximizing rule. b) If your answer to (a) was "no," then should Kirk have bought More or Fewer coffees? More or Fewer doughnuts? Explain.