Question

Assume that there are four families in a country.the average per capita income of these families is 10000.of the income of three family is 8000 14000 and 6000.find income of fourth family

Answer 1

total income of four families=10000*4
                                           =40000
total income of 3 families=8000+14000+600
                                       =28000
therefore 4 family income=40000-28000
                                        =12000