2) Cost of an MP3 player: $$ \$ 139.99 $$ Markup: $$ 25 \% $$ Discount: $$ 10 \% $$ Tax: $$ 2 \% $$

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To determine the final price of the MP3 player after applying the markup, discount, and tax, follow these steps:

1. **Original Cost:**  
   The starting price of the MP3 player is **\$139.99**.

2. **Apply Markup (25%):**  
   A 25% markup increases the original cost.
   $$
   \text{Markup Amount} = 139.99 \times 0.25 = \$34.9975
   $$
   $$
   \text{Price After Markup} = 139.99 + 34.9975 = \$174.9875
   $$
   *Rounded to two decimal places:* **\$174.99**

3. **Apply Discount (10%):**  
   A 10% discount reduces the price after markup.
   $$
   \text{Discount Amount} = 174.99 \times 0.10 = \$17.499
   $$
   $$
   \text{Price After Discount} = 174.99 - 17.499 = \$157.491
   $$
   *Rounded to two decimal places:* **\$157.49**

4. **Apply Tax (2%):**  
   A 2% tax is added to the price after discount.
   $$
   \text{Tax Amount} = 157.49 \times 0.02 = \$3.1498
   $$
   $$
   \text{Final Price} = 157.49 + 3.1498 = \$160.6398
   $$
   *Rounded to two decimal places:* **\$160.64**

**Final Price of the MP3 Player:** **\$160.64**

---

**Alternatively, Using Multiplicative Factors:**

You can also calculate the final price by multiplying the original cost by the respective factors for markup, discount, and tax.

1. **Markup Factor:**  
   25% markup → Multiply by **1.25**

2. **Discount Factor:**  
   10% discount → Multiply by **0.90**

3. **Tax Factor:**  
   2% tax → Multiply by **1.02**

$$
\text{Final Price} = 139.99 \times 1.25 \times 0.90 \times 1.02 = 160.64
$$

Therefore, the **final price** of the MP3 player is **\$160.64**.
The final price of the MP3 player is \$160.64.

2) Cost of an MP3 player: \( \$ 139.99 \) Markup: \( 25 \% \) Discount: \( 10 \% \) Tax: \( 2 \% \)

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