5. Here is the (approximate) CPI over the past five decades: Year CPI 1970s 18 1980s 36 1990s 60 2000s 80 2010s 100 In which decade was inflation the highest? (show your work) In which decade was inflation the lowest? (show your work) 6. You take out a mortgage at 6 percent. You and the lender both expect inflation over the next 30 years to average 2 percent. If you are correct, what will the real rate of interest be on the loan?Use the following CPI data to answer questions 8 and 9: 8. Tuition and required fees for full-time undergraduate students at John Jay were $5.759 in 2012 and $6.810 in 2016. By what percent has real tuition and required fees increased? 9. Suppose your yearly income in 2012 was $48,000 and in 2017 it was $53,000. By what percent has your yearly income increased