Answer and Explanation:
The computation of the missing data  is shown below:
<u>Particulars     North American    Asian            European</u>
<u>                      division                 Division            Division
</u>
Sales            $2,000,000        $5,000,000     $1,050,000
Net Operating 
Income        $80,000             $200,000            $168,000
Operating 
assets          $500,000          $2,000,000         $700,000
Return on 
Investment   16%                      10%                       24%
Return on sales 0.04              0.04                       0.16
Investment 
turnover            4                     2.5                          1.5
Working notes :  
1. For North American division 
Sales is 
= Net operating income ÷ return on sales 
= $80,000  ÷ 0.04 
= $2,000,000
Operating assets is 
= Net Operating income ÷ return on investment 
= $80,000 ÷ 16% 
= $500,000
Investment turnover is 
= Sales ÷ operating assets 
= $2,000,000 ÷ $500,000 
= 4
For Asian Division 
Operating assets is 
= Net operating income  ÷  return on investment 
= $200,000  ÷ 10% 
= $2,000,000
Return on sales is 
 = Net Operating income ÷ sales 
= $200,000 ÷ $5,000,000 
= 0.04
Investment turnover is 
 = Sales ÷ operating assets 
= $5,000,000  ÷ $2,000,000
= 2.5
For European division:
Sales is 
= Operating assets × investment turnover 
= $700,000 × 1.5 
= $1,050,000
Return on investment is 
= Net operating income ÷  operating assets × 100 
= $168,000 ÷ $700,000
= 24%