To determine which orchard would be cheaper for a class of 18 students, let's calculate the total cost for each orchard.
Orchard A:
- Admission cost per person: $9
- Total number of people (students + chaperones): 18 students + 3 chaperones = 21 people
- Total cost for Orchard A: \[ 21 \text{ people} \times 9 \text{ dollars/person} = 189 \text{ dollars} \]
Orchard B:
- Admission cost per person: $10
- Total number of people (students + chaperones): 18 students + 1 chaperone = 19 people
- Total cost for Orchard B: \[ 19 \text{ people} \times 10 \text{ dollars/person} = 190 \text{ dollars} \]
Now we compare the total costs:
- Orchard A: $189
- Orchard B: $190
Conclusion:
Orchard A is cheaper than Orchard B by $1.
The answer is Orchard A.