SELECT T2.Name FROM employment AS T1 JOIN people AS T2 ON T1.People_ID  =  T2.People_ID JOIN company AS T3 ON T1.Company_ID  =  T3.Company_ID WHERE T3.Sales_in_Billion  >  200
Show the names of employees that work for companies with sales bigger than 200.
[Schema (values) (types)]: | company_employee |  people : people_id (text) , age (number) , name (number) , nationality (text) , graduation_college (text) | company : company_id (text) , name (number) , headquarters (number) , industry (text) , sales_in_billion (text) , profits_in_billion (text) , assets_in_billion (number) , market_value_in_billion (text) | employment : company_id (text) , people_id (number) , year_working (number);