Out of her total income Mrs Sharma spends 20% on house rent and 70% of the rest on household expenditure. If she saves rs 1800, what is the total income?

she saves 1800 ie 10 %

her income = x

10% of x =1800

10/100*x=1800

x=1800x100/10

x=180000/10

x=18000

her income is Rs 18000