To calculate the Total Paid for each present, we will first determine the discounted price for each item, and then add the additional amount of (+2) as specified.
1. Power Tools:
- Cost: \( d = 50 \)
- Discount: 15%
- Discount Amount: \( 50 \times 0.15 = 7.5 \)
- Discounted Price: \( 50 - 7.5 = 42.5 \)
- Total Paid: \( 42.5 + 2 = 44.5 \)
2. Water Skis:
- Cost: \( d + 15 = 50 + 15 = 65 \)
- Discount: 25%
- Discount Amount: \( 65 \times 0.25 = 16.25 \)
- Discounted Price: \( 65 - 16.25 = 48.75 \)
- Total Paid: \( 48.75 + 2 = 50.75 \)
3. Jewelry:
- Cost: \( d - 5 = 50 - 5 = 45 \)
- Discount: 10%
- Discount Amount: \( 45 \times 0.10 = 4.5 \)
- Discounted Price: \( 45 - 4.5 = 40.5 \)
- Total Paid: \( 40.5 + 2 = 42.5 \)
Now, we can summarize the Total Paid amounts:
- Power Tools: \( 44.5 \)
- Water Skis: \( 50.75 \)
- Jewelry: \( 42.5 \)
The most economical or cheapest option is Jewelry with a Total Paid of 42.5.