Subject: mathqa
Question: in plutarch enterprises , 70 % of the employees are marketers , 10 % are engineers , and the rest are managers . marketers make an average salary of $ 50000 a year , and engineers make an average of $ 80000 . what is the average salary for managers if the average for all employees is also $ 80000 ?
Option: 
A: $ 80,000
B: $ 370,000
C: $ 130,000
D: $ 320,000
Answer: B