A poll reveals that the average (arithmetic mean) income of 10 households is $25,000. If 6 of the households...

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A

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C

D

E

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Source: Official Guide

A poll reveals that the average (arithmetic mean) income of 10 households is $25,000. If 6 of the households have incomes of $30,000 each, what is the average income of the other 4 households?

A. $21,500
B. $20,500
C. $17,500
D. $7,500
E. $7,000

The OA is C