Math Problem Statement

Anne works in New York City and makes $42 per hour. She works in an office and must get her suit dry cleaned every day for $75. If she wants to make more than $260 a day, at least how many hours must she work?

Solution

Let's break down the problem step by step to solve it:

Given:

  • Anne earns $42 per hour.
  • Her daily expense for dry cleaning is $75.
  • She wants to earn more than $260 a day after covering her dry cleaning costs.

Let:

  • hh be the number of hours she works.

Total earnings:

Anne's total daily earnings are 42h42h.

Net earnings:

After deducting her daily expense of $75 for dry cleaning, her net earnings are 42h7542h - 75.

Condition:

She wants her net earnings to be more than $260, so we set up the inequality: 42h75>26042h - 75 > 260

Solve for hh:

  1. Add 75 to both sides: 42h>33542h > 335

  2. Divide both sides by 42: h>335427.98h > \frac{335}{42} \approx 7.98

Conclusion:

Anne must work at least 8 hours to meet her goal of making more than $260 a day.

Would you like further details or explanations on any part? Here are 5 related questions for deeper understanding:

  1. What would be Anne's total earnings if she worked for exactly 8 hours?
  2. How much would Anne earn if her dry cleaning cost increased to $100 per day?
  3. What if Anne received a raise and started making $50 per hour—how would that affect her working hours to reach the goal?
  4. How would her required hours change if her daily expense was reduced by 10%?
  5. What if she wanted to make exactly $400 per day after covering dry cleaning expenses—how many hours would she need to work?

Tip:

When solving inequalities, always remember to check your final solution by plugging it back into the original context to ensure it satisfies all conditions.

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Math Problem Analysis

Mathematical Concepts

Inequality
Linear equations

Formulas

Net earnings = Hourly wage * Hours worked - Expenses

Theorems

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Suitable Grade Level

Grades 6-8