$12.$ We have budgeted $\backslash (\backslash$$ $328,000\backslash )$ to be used by both the marketing and the finance department. The marketing department uses cash at the rate of $\backslash (\backslash$$ $42,000\backslash )$ per month $($three times the rate of the finance department$).$ How many months until the budgeted amount is used up$?$ Round to the nearest tenth.

A$.7\mathrm{.}8$ months

B$.5\mathrm{.}9$ months

C$.2\mathrm{.}6$ months

D$.6\mathrm{.}2$ months