Suppose there are 4 families in a country with per capita income of $15,000. The income of 3 families is $10,000, $20,000 and $12,000 respectively. What is the income of the 4th family? [CBSE 2014]
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Answer:
18000
Explanation:
15000×4=60000
60000-(10000+20000+12000)=18000
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