Can someone explain how to answer this step by step, with the formulas?

Can someone explain how to answer this step by step, with the formulas?

Piazza Corp has sales of $400,000, a contribution margin ratio of 40%, and a profit of $40,000. If 20,000 units were sold, what is the break-even point in units?

AACOUNTINGWe know that sales revenue-variable cost =contributionBut we know thatSales=$400,000Contribution margin=0.4Profit=$40,000Unit sold=20,000BEP in units is found byTotal fixed...