To find how much more it will cost a group of 3 friends to ride 8 rides each than to ride 3 rides each, we need to calculate the total cost for each scenario.
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Cost for 8 rides each:
- Admission for 3 friends: \[ 3 \text{ friends} \times 8.25 \text{ (admission)} = 24.75 \]
- Riding 8 rides each: \[ 3 \text{ friends} \times 8 \text{ rides} \times 1.50 \text{ (per ride)} = 36.00 \]
- Total cost for riding 8 rides each: \[ 24.75 + 36.00 = 60.75 \]
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Cost for 3 rides each:
- Admission for 3 friends (same cost as above): \[ 24.75 \]
- Riding 3 rides each: \[ 3 \text{ friends} \times 3 \text{ rides} \times 1.50 \text{ (per ride)} = 13.50 \]
- Total cost for riding 3 rides each: \[ 24.75 + 13.50 = 38.25 \]
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Difference in cost: To find out how much more it will cost to ride 8 rides each than to ride 3 rides each: \[ 60.75 - 38.25 = 22.50 \]
Thus, the additional cost will be: \[ \boxed{22.50} \]