Using the table below, with smoothing constants of $\backslash$alpha $=\mathrm{.}60,$ forecast sales for month $7$ using exponential smoothing.

Month

Units Sold

$1$

$8$

$2$

$3$

$3$

$4$

$4$

$5$

$5$

$12$

$6$

$10$

$7$

Group of answer choices

$9\mathrm{.}10$

$9\mathrm{.}64$

$7\mathrm{.}87$

$8\mathrm{.}80$