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Juan organizes the stamps in his collection by country and by the decade in which they were issued. The prices he paid for them at a stamp shop were: Brazil and France, $6$ cents each, Peru $4$ cents each, and Spain $5$ cents each. (Brazil and Peru are South American countries and France and Spain are in Europe.)

Let's analyze the information given in the table along with the prices for the stamps to determine the total cost of Juan's stamp collection.

First, let's calculate the total number of stamps Juan has from each country:

**Brazil:**
- 50s: 4
- 60s: 7
- 70s: 12
- 80s: 8

Total stamps from Brazil = 4 + 7 + 12 + 8 = 31

**France:**
- 50s: 8
- 60s: 4
- 70s: 12
- 80s: 15

Total stamps from France = 8 + 4 + 12 + 15 = 39

**Peru:**
- 50s: 6
- 60s: 4
- 70s: 6
- 80s: 10

Total stamps from Peru = 6 + 4 + 6 + 10 = 26

**Spain:**
- 50s: 3
- 60s: 9
- 70s: 13
- 80s: 9

Total stamps from Spain = 3 + 9 + 13 + 9 = 34

Next, we calculate the total cost of the stamps from each country by multiplying the number of stamps by their respective prices:

**Brazil:**
- Total stamps: 31
- Price per stamp: 6 cents
- Total cost: 31 * 6 = 186 cents

**France:**
- Total stamps: 39
- Price per stamp: 6 cents
- Total cost: 39 * 6 = 234 cents

**Peru:**
- Total stamps: 26
- Price per stamp: 4 cents
- Total cost: 26 * 4 = 104 cents

**Spain:**
- Total stamps: 34
- Price per stamp: 5 cents
- Total cost: 34 * 5 = 170 cents

Finally, we sum the costs to find the total cost of Juan's stamp collection:

Total cost = 186 + 234 + 104 + 170 = 694 cents

Thus, the total cost of Juan's stamp collection is 694 cents.

Would you like more details or have any questions? Here are some questions you might ask:

1. How to determine the number of stamps from a specific country and decade?
2. How to convert the total cost from cents to dollars?
3. How to find the average cost per stamp?
4. How to represent this data graphically?
5. How to compare the costs of stamps from South American vs. European countries?

**Tip:** When working with tables and costs, always ensure you carefully multiply and add to avoid errors, especially when dealing with different price categories.

Learn how to calculate the total cost of Juan's stamp collection based on stamps from Brazil, France, Peru, and Spain. This problem involves basic arithmetic operations such as multiplication and addition. Suitable for students in Grades 5-6.

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