A survey reveals that the average income of a company’s customers is $45,000 per year. If 50 customers respond to the survey and the average income of the wealthiest 10 of those customers is $55,000, what is the average income of the other 40 customers?
Is there a way to solve this using weighted average concept instead of doing tedious calculations?
Select
A) $27,500
B) $35,000
C) $37,500
D) $42,500
E) $50,000
let x be the average of 40 customers   40*x + 10* 55000 = 50*45000   solving this we have x= 42500   Answer is $42,500.
<result>D</result>
A survey reveals that the average income of a company’s customers is $45,000 per year. If 50 customers respond to the survey and the average income of the wealthiest 10 of those customers is $55,000, what is the average income of the other 40 customers?
Is there a way to solve this using weighted average concept instead of doing tedious calculations?