Pinter Corporation produces three products and is currently short on machine hours since one of its two machines is down; only $646$ machine hours are available this month. The selling prices, costs, labor requirements, and demand for the three products are as follows:

$\backslash$table$[[,$Product A$,$Product B$,$Product C$],[$Sales price,$$7\mathrm{.}20,$$$5\mathrm{.}20,$$$7\mathrm{.}20$