how do you find the net profit margin???

so the equation for net profit margin = net income/revenues. so wouldn't it be 835/1800 which equals 0.46?

^^^^^^^ net profit is the part I need assistance with, explain please why I'm not right

Credit BARB'S BOOK BUSINESS Unadjusted Trial Balance At February 28 Account Name Debit Cash $ 13,910 Accounts Receivable 225 Supplies 300 Prepaid Rent 2,400 Land 7,500 Equipment 2,500 Notes Payable (long-term) Common Stock Sales Revenue Advertising Expense 425 Salaries and Wages Expense 420 Repairs and Maintenance Expense 120 Total $ 27.800 10,000 16,000 1,800 $ 27,800 Refer to the revenues and expenses shown on the unadjusted trial balance. Based on this information, calculate preliminary net income and net profit margin? (Round your Net Profit Margin answer to 1 decimal place.) $ 835 Preliminary Net Income Net Profit Margin %