can someone explain to me why this formula isnt working on excel? everything seems to be done right and it still wont work. ive tried everything. please help

from the Instruction tab you will be marked wrong.) Return on Investme Profit Margin Ratio Asset Turnover Ratio AO =ROUND([@[Operating Income]][@[Net_Sales]],3) Suu.00 ROUND(number, num digits) ,770.00 ,000.00 The syntax of this name isn't correct. ent X Verify that the name: -Starts with a letter or underscore ) -Doesn't include a space or character that isn't allowed -Doesn't conflict with an existing name in the workbook. OK