Income or living expense replacement ratios:

a$.$Are consistently pegged at $90\%$ of current income on the first day of retirement

b$.$Should be between $40\%$ and $60\%$ of income on the first day of retirement

c$.$Should be between $70\%$ and $80\%$ of income on the last work day

d$.$Vary between $70\%$ and $100\%$ with low$-$ and high$-$income$-$earning households needing the highest replacement ratios