Help me and explain how I get the answer please? Thanks

The following totals are used to create a or Frederick Company for FY2018: Frederick Company Selected Financial Figures For the Year Ended 12/31/18 Sales (100 units) $10,000 Variable Costs: Direct Labor $1,600 Direct Materials 1.050 Factory Overhead (variable) 2,000 Selling Expenses (variable) 600 Administrative Expenses (variable) 500 Fixed Costs: Factory Overhead (fixed) $900 Selling Expenses (fixed) 1000 Administrative Expenses (fixed) 1.000 Frederick Company utilizes a Ill production system and there are no Raw Mate Work in Process or Finished Goods Inventories, Use this information to determine FY 2018 Contribution Margin Percentage. Enter percentage 19 one decimal place, (example enter 35:576 84 35.9)