Rory$$s company sells laptop computers for $$700$ and high$-$end desktop computers for $$1,800.$ The unit variable cost for the laptops is $$300,$ while the unit variable cost for the desktops is $$700.$ Rory determined that the sales mix as a percentage of units sold is $70\%$ for the laptops and $30\%$ for the desktops. What is the weighted$-$average unit contribution margin for these products?

Select answer from the options below

$$610$

$$1,030$

$$1,050$

$$420$