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 $65,000, 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?  Options
A) $27,500	B) $35,000	C) $37,500	D) $40,000	E) $50,000
let x be the average of 40 customers   40*x + 10* 65000 = 50*45000   solving this we have x= 40000   Answer is $40,000.
<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 $65,000, 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?