How do I find the Return on Sales for Tesla? (ROS)

INCOME STATEMENT BALANCE SHEET CASH FLOW FINANCIAL RATIOS IN USD THOUSANDS ANNUAL V PERIOD ENDING: 12/31/2019 12/31/2018 12/31/2017 Total Revenue $24,578,000 $21,461,000 $11,759,000 Cost of Revenue $20,509,000 $17,419,000 $9,536,000 Gross Profit $4,069,000 $4,042,000 $2,223,000 OPERATING EXPENSES Research and Development $1,343,000 $1,460,000 $1,378,000 Sales, General and Admin. $2,646,000 $2,835,000 $2,477,000 Non-Recurring Items $149,000 $135,000 $0 Other Operating Items $0 $0 $0 Operating Income - $69,000 - $388,000 - $1,632,000 Add'l income/expense items $89,000 $46,000 -$ 106,000 Earnings Before Interest and Tax $20,000 -$342,000 -$1,738,000 Interest Expense $685,000 $663,000 $471,000 Earnings Before Tax -$665,000 -$1,005,000 -$2,209,000 Income Tax $110,000 $58,000 $32,000 Minority Interest $0 $0 $0 Equity Earnings/Loss Unconsolidated Subsidiary -$87,000 $87,000 $279,000 Net Income-Cont. Operations -$862,000 -$976,000 -$1,962,000 Net Income -$862,000 -$976,000 -$ 1,962,000 Net Income Applicable to Common Shareholders - $ 862,000 - $976,000 - $1,962,000