ANSWER:
The monthly income of lauren is $2700
SOLUTION:
Given that, Lauren spends 30% of her monthly income on rent
Let the monthly income of lauren be x.
Then, 30% of x = rent payment -- eqn (1)
And also given that, lauren pays $810 for rent
rent payment = $810
Now, substitute rent payment in eqn (1)
30% of x =810
30%
x = 810
30/100
x = 810
30
x = 810
100
x =

x = 2700
Hence, the monthly salary of lauren is $2700.