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Let's break down the problem.

Liam is selling coffee mugs to raise money for a trip:
- He buys each mug for **$3**.
- He sells each mug for **$7**.
- He sells **100** mugs.

To calculate how much money he earns, we need to determine his profit per mug:
- The **profit per mug** is the difference between the selling price and the cost price:  
  $ 7 - 3 = 4 $ dollars profit per mug.

Now, we multiply the profit per mug by the number of mugs sold:
\[ 4 \times 100 = 400 \]

So, Liam will earn **$400** toward his trip.

Would you like any further details on this solution? Here are five related questions for practice:

1. What if Liam sold the mugs for $8 each? How much profit would he earn?
2. If Liam only sold 50 mugs, what would his total profit be?
3. How much would Liam earn if he sold 200 mugs at the same prices?
4. What would happen to Liam's profit if the cost per mug increased to $4?
5. If Liam wanted to earn $500, how many mugs would he need to sell at $7 each?

**Tip:** Always calculate profit per unit when given both cost price and selling price to determine total earnings!

Liam is selling coffee mugs to raise money for a trip. He buys mugs for $3 each and sells them to customers for $7 each. If he sells 100 coffee mugs, how much money will he have earned toward his trip?

Learn how to calculate total profit when selling coffee mugs at a profit of $4 per mug. In this example, Liam buys mugs for $3 each and sells them for $7, making $400 in total profit by selling 100 mugs.

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