McKinsey & Co. surveyed 12,000 Canadian households equally divided among low, middle, and high incomes as to whether they would be able to maintain their lifestyle after they stopped working, taking into account savings, pensions, and government payments. The results were that 93% of low income households would be able to do this and that 77% of middle and high income households (combined) would be able to. Calculate 90% confidence intervals on these percentages.