Each month, after Jill pays for rent, utilities, food, and other necessary expenses, she has one fifth of her net monthly salary left as discretionary income. Of this discretionary income, she puts 30% into a vacation fund, 20% into savings, and spends 35% on eating out and socializing. This leaves her with $111 dollar, which she typically uses for gifts and charitable causes. What is Jill’s net monthly salary?  Choices:
A) $ 2400 B) $ 3200 C) $ 6000 D) $ 6400 E) $ 3700

Rationale: "let x be the monthly salary 15 % of 1 / 5 * x = 111 x = 3700 answer e"
Answer: E