The following table shows the total sales, in thousands, since a new game was brought to market.

$\backslash$table$[[$Month$,0,2,4,6,8,10,12,14],[$Sales$,0,2\mathrm{.}2,5\mathrm{.}4,9\mathrm{.}5,19\mathrm{.}1,27\mathrm{.}2,32\mathrm{.}9,35\mathrm{.}4]]$

$($a$)$ Plot this data and determine the point of diminishing returns.

Enter the closest value in the table.

The point of diminishing returns occurs months after the game is introduced.

$($b$)$ Predict total possible sales of this game, using the point of diminishing returns from the table.

Total sales ~~