To determine which store charges the least per balloon, we need to calculate the price per balloon for each store.
A) Parties R Us:
- Cost: $4.80 for 16 balloons
- Price per balloon = $4.80 / 16 = $0.30
B) Balloon Land:
- Cost: $3.84 for 12 balloons
- Price per balloon = $3.84 / 12 = $0.32
C) Balloons O Rama:
- Cost: $3.69 for 9 balloons
- Price per balloon = $3.69 / 9 = $0.41
D) Party World:
- Cost: $4.35 for 15 balloons
- Price per balloon = $4.35 / 15 = $0.29
Now we have the price per balloon for each store:
- Parties R Us: $0.30
- Balloon Land: $0.32
- Balloons O Rama: $0.41
- Party World: $0.29
The lowest price per balloon is at Party World at $0.29.
Thus, the answer is D) Party World.