The sales by Walker's Milk and diary products, in millions of dollars, for the seven-year period from 2014 to 2020 are reported in the following table.

Years	Sales ($ millions)
2014	16.6
2015	18.3
2016	20.9
2017	22.3
2018	23.5
2019	25.0
2020	27.1

a) Determine the least squares trend equation.(Round the final answers in millions of dollars to 2 decimal places.)

Y' = ----- + ----t

b) Estimate sales for 2015.( Round the intermediate calculations and the final answers in millions of dollars to 2 decimal places.)

For 2015, sales = ------- ($million)