Sapphire sells two products: ordinary laptops and premium laptops. Ordinary laptops are priced at $605 each and premium laptops are priced at $1,105 each. The variable cost per unit is $555 per ordinary laptop and $1,040 per premium laptop. Total fixed cost is $145,750. Sapphire's expected sales mix is four ordinary laptops to one premium laptop. Calculate the break-even point in units for ordinary laptops.

a.470 laptops b.2,200 laptops c.1,040 laptops d.550 laptops

I know the answer is B. If you could please show me how to get to that solution. Any extra explanation would be helpful. Thank you!