Reuben Corporation sells two types of computer chips.

The sales mix is $60\%($Q$-$Chip$)$ and $40\%($Q$-$ChipPLUS$).$

Q$-$Chip has variable costs per unit of $$60$ and a selling price of $$100.$

Q$-$ChipPLUS has variable costs per unit of $$70$ and a selling price of $$130.$

Reuben's fixed costs are $$522,000.$

How many units of Q$-$ChipPLUS would be sold at the break$-$even point?