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"A student bought 3 pens at the rate of $4 per pen. Each pen has a discount of 10%. What is the cost of three pens after the discount?"

### Solution:
1. **Initial Price Calculation:**
   - Price of one pen before discount = $4
   - Price of three pens before discount = $ 3 \times 4 = 12 $ dollars.

2. **Discount Calculation:**
   - Discount per pen = $ 10\% $ of $4 = $ 0.10 \times 4 = 0.40 $ dollars.
   - Discount on three pens = $ 3 \times 0.40 = 1.20 $ dollars.

3. **Final Cost After Discount:**
   - Cost after discount = $ 12 - 1.20 = 10.80 $ dollars.

So, the cost of three pens after the discount is **$10.80**.

Would you like any further details or have any questions?

### Related Questions:
1. What would be the total cost if the discount was 15% instead of 10%?
2. If the original price of each pen was $5, what would the cost be after a 10% discount?
3. How much would the student save if they bought 5 pens instead of 3?
4. What would be the cost if only two of the three pens were discounted?
5. How would the final price change if an additional tax of 5% is applied after the discount?

**Tip:** When calculating percentages, it’s helpful to first find the percentage amount for a single item, then multiply by the quantity.

A student bought 3 pens at the rate of $4 per pen. Each pen has a discount of 10%. What is the cost of three pens after the discount?

Discover how to calculate the cost of three pens after a 10% discount with this math problem solution. Explore arithmetic and percentage calculations. Suitable for students in Grades 6-8.

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