Deduct any multiple section discount then work out additional discounts consecutively as follows:
1. discount $1000 - 20% = $800
2. discounts $1000 - 20% = $800 - 5% = $760
3. discounts $1000 - 20% = $800 - 5% = $760 - 5% = $722
This is NOT the same as a single 30% discount.