Handle repeated gain, loss, and discount through multipliers.
What to focus on
- Multiply factors instead of adding percentages.
- Check net result after both steps.
Quick formula / idea
- Net factor = (1 ± a/100)(1 ± b/100)
A 20% gain followed by 10% loss gives net factor 1.20 × 0.90 = 1.08, so 8% gain.
Practice prompts
- Find net effect of +25% and -20%.
- Find net effect of two discounts 10% and 5%.