Just need some help on this one question please

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Many thanks and God bless!!!

Funtime Park competes with Splash World by providing a variety of rides. Funtime sells tickets at $85 per person as a one-day entrance fee. Variable costs are $17 per person, and fixed costs are $428,400 per month. The breakeven number of tickets is 6,300. If Funtime Park expects to sell 6,450 tickets, compute the margin of safety in tickets and in sales dollars. Begin by selecting the formula labels and then entering the amounts to compute the margin of safety in units. Expected sales Breakeven sales Margin of safety in units