please explain how i obtain part b... thank you :)

Margin of Safety a. If Canace Company, with a break-even point at $452,600 of sales, has actual sales of $620,000, what is the margin of safety expressed (1) in dollars and (2) as a percentage of sales? Round the percentage to the nearest whole number. 1. $167,400 2. L 27 % b. If the margin of safety for Canace Company was 25%, fixed costs were $1,470,000, and variable costs were 75% of sales, what was the amount of actual sales (dollars)? (Hint: Determine the break-even in sales dollars first.) $ 4,287,500 x