Please show me the names of employees that work for companies with sales bigger than 200
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
please show me the average age of those employees
select avg ( t2.age ) 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