Contribution format income statement

How do I prepare an income statement for haaki shop.

Sales..................... $800,000
Cost of goods sold.. 300,000

Gross margin......... 500,000
Selling and adminstrative expenses
selling expense $250,000
administrative expense 160,000 410,000
Net operating income 90,000

The surfboards sell, on the average, for $400 each. The department's variable selling expenses are $50 per surfboard sold. The remaining selling expenses are fixed. The administrative expenses are 25% variable and 75% fixed. The company purchases its surfboards from a supplier at a cost of $150 per surfboard.

Please help me. I am stuck