Question

Alka spends 90 percent of money that she receives every month that is120 what is monthly income ?

Answer 1

90% means 120
1% means 120/90
100% means 120/90×100=133.33

Answer 2

Answer is 133.33
90% is 90/10
Let salary be x
90% of x = 120
90/100*x = 120
Therefore 120*100/90 is the salary which is 133.33