A survey reveals that the average income of a company’s customers is $50,000 per year. If 50 customers respond to the survey and the average income of the wealthiest 10 of those customers is $75,000, 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?  Choose the correct choice from the following choices:
A) $27,500
B) $43,750
C) $37,500
D) $42,500
E) $50,000
let x be the average of 40 customers   40*x + 10* 75000 = 50*50000   solving this we have x= 43750   Answer is $43,750.
<result>B</result>
A survey reveals that the average income of a company’s customers is $50,000 per year. If 50 customers respond to the survey and the average income of the wealthiest 10 of those customers is $75,000, 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?