A survey reveals that the average income of a company’s customers is $45,000 per year. If 40 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 30 customers?
Is there a way to solve this using weighted average concept instead of doing tedious calculations?  Choose the most appropriate option:
A) $27,500  B) $35,000  C) $37,500  D) $42,500  E) $50,000
let x be the average of 30 customers   30*x + 10* 75000 = 40*45000   solving this we have x= 35000   Answer is $35,000.
<result>B</result>
A survey reveals that the average income of a company’s customers is $45,000 per year. If 40 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 30 customers?
Is there a way to solve this using weighted average concept instead of doing tedious calculations?