please explain this properly with proper steps

Sheridan Corporation sells a single product for $50. Its management estimates the following revenues and costs for the year 2022: $570,000 102,600 $22,800 22,800 Net sales Direct materials Direct labour Manufacturing overhead-variable Manufacturing overhead-fixed Selling expenses-variable Selling expenses --fixed Administrative expenses-variable Administrative expenses--fixed 68,400 11.400 22,800 11.400 34,200 Assume the price remains at $50 per unit and variable costs remain the same per unit, but fixed costs increase by 20% annually Calculate the percentage increase in unit sales required to achieve the same level of annual operating income calculated in part second part. (Round answer to 2 decimal places, e.g. 15.25%.) Percent increase in unit sales %