Let her previous monthly income be p

The cost of her rent and utilities was 40% of p which is (40/100)*p = 2p/5

Her income was increased by $600 so it is now p+$600

The cost of her rent and utilities now amount to 25% of (p+$600) which is (25/100)*(p+$600) = (p+$600)/4

Equating both expressions for cost of rent and utilities: 2p/5 = (p+$600)/4

Multiplying both sides of the equation by 20 gives 8p = 5p+$3000

Subtracting 5p from both sides gives: 3p = $3000

Dividing both sides by 3 gives p = $1000

# Answer

1000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Mrs. Snyder used to spend 40% of her monthly income on rent and utilities. Her salary was recently increased by $600 so now her rent and utilities only amount to 25% of her monthly income. How much was her previous monthly income?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1000
Mrs. Snyder used to spend 40% of her monthly income on rent and utilities. Her salary was recently increased by $600 so now her rent and utilities only amount to 25% of her monthly income. How much was her previous monthly income?
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