A model for the Consumer Price Index (CPI) for the period July 2005 (t = 0) to March 2006 (t = 8), where t is in months, is given by the function,
(t)= 0.06t³-0.8t² +3.1t+195
According to the model, what was the monthly inflation rate in November 2005?
O 0.312% /month
O -0.202% /month
O-0.212% /month
O-0.363% /month
O 0.125 % /month.