Problem $3-12($Algo$)$

The following equation summarizes the trend portion of quarterly sales of condominiums over a long cycle. Sales also exhibit

seasonal variations.

$F_t=69-5\mathrm{.}9t+4\mathrm{.}9t^2$

where

$F_t=$ Unit sales

$t=0$ at the first quarter of last year

Click here for the Excel Data File

Using the information given, prepare a forecast of sales for each quarter of next year $($not this year$),$ and the first quarter of the year

following that. $($Round intermediate calculations and final answers to $2$ decimal places.$)($THIS IS NOW THE $5$TH TIME IVE SUBMITTED THIS AND IT WAS HAS BEEN WRONG EVERY TIME, please answer it correctly$).$