Question

Alka spends 90 percent of the money that she receives every month , and saves Rs.120. How much money does she get monthly?

Answer 1

Let the total money be x 

now money she spends = 90x/100

money she saves = 120

NOW

90x/100 + 120 = x 

x - 90x/100 = 120

10x/100 = 120 

x = 120 x 100/10 

x = 1200

she earns 1200

Answer 2

she get 1200rupes monthly