Method 1: Find discount, then subtract $\text{Discount} = 0.25 \times 40 = 10$ $\text{Sale price} = 40 - 10 = 30$

Method 2: Multiply by (1 - 0.25) $\text{Sale price} = 40 \times 0.75 = 30$

Answer: \30$

Use percent increase formula:

$\text{Percent Increase} = \frac{\text{New} - \text{Original}}{\text{Original}} \times 100\%$

$= \frac{300 - 250}{250} \times 100\%$

$= \frac{50}{250} \times 100\%$

$= 0.2 \times 100\% = 20\%$

Answer: 20% increase

Method 1: Find discount, then subtract Step 1: Find 30% of $80. 0.30 × 80 =$24 discount

Step 2: Subtract from original. $80 -$24 = $56

Method 2: Find what you pay directly Step 1: If 30% off, you pay 70%. 100% - 30% = 70%

Step 2: Find 70% of $80. 0.70 × 80 =$56

Answer: $56

Part 1: Original percentage Step 1: Set up the fraction. 17/20

Step 2: Convert to decimal. 17 ÷ 20 = 0.85

Step 3: Convert to percent. 0.85 = 85%

Part 2: With bonus points Step 1: New score. 17 + 5 = 22 points earned Total still out of 20 (bonus goes above 100%)

Step 2: Calculate percent. 22/20 = 1.10 = 110%

Answer: Original: 85%, With bonus: 110%