Hi, can i just get some help with this question. I'm stuck on the wording where it says the sales mix remains unchanged. I understand how to find the sales mix but I don't understand how to apply that into the calculation.

1. Light Ltd. produces lighting fixtures. For the upcoming period, the company has provided the folowing budget information for two of its product lines: Product A Product B Sales (units) 120,000 400,000 Sales $ 6,000,000 $ 48,000,000 Less: variable costs (2,400,000) $[33,000,000 } Contribution margin $ 3,600,000 10, 000, 000 Less: xed costs (2,398,000) (6,200,000) Operating prot (loss) i 1,202,000 i 3,800,000 If Light wishes to achieve a total net (after-tax) income of $7,000,000 and has a tax rate of 30%, how many units of Product B must it sell if the sales mix remains unchanged