I need help finding return on total assets

Comparative financial statements for Weller Corporation, a merchandising company. for the year ending December 31 appear below. The company did not issue any new common stock during the year. A total of 800,000 shares of common stock were outstanding. The Interest rate on the bond payable was 12%, the income tax rate was 40%, and the dividend per share of common stock was $0.75 last year and $0.40 this year. The market value of the company's common stock at the end of this year was $18. All of the company's sales. are on account. Required: Compute the following financial data for this year: 1. Gross margin percentage. (Round your percentage answer to 1 decimal ploce (i.e., 0.1234 should be entered os 12.3).) 2. Net profit margin percentage. (Round your percentage answer to 1 decimal place (i.e., 0.1234 should be entered os 12.3 ).) 3. Return on total assels. (Round your percentoge onswer to 1 decimal place (i.e., 0.1234 should be entered as 12.3).) 4. Return on equity. (Round your pereentage answer to 2 decimal ploces (i.e., 0.1234 should be entered as 12.34).)