Question

please answer my question​

Answer 1

let the income of fourth family be x.

per capita income= Total income /total population..

15000 = 10000+20000+12000+x / 4

15000*4 = 42000+ x

60000 = 42000+x

x = 60000 - 42000

x = 18000

Hence,

Income of fourth family is 18000..

hope it helps!!!!