Answer:
a) real income in one year = $65,000/1.05 = $61,904.76
real income in two year = $65,000/1.05² = $58,956.92
real income in three year = $65,000/1.05³ = $56,149.44
b) if you have a COLA agreement, then your salary will adjust to inflation. This means that your real salary will remain the same during the 3 years = $70,000 per year.
In this case, your nominal salary will increase by 5% each year, but your salary will remain equal.