Gabby Arkin sels homemade knit scarves for $20 each at local craft shows. Her contribution margin ratio is 62.5%. Currently, the cratt show entrance fees cost Gabby $500 per year. The crat ahows an raising their entrance foes by 10% next year. How many extra scarves well Gabby have fo sell next year fust to pay for rising entrance fee costs? Begin by identifing the general formula to compute the breakeven sales in unis