To find out how many gallons of perfume will be in each container, we need to divide the total gallons of perfume by the number of containers.
- Total gallons of perfume: 10.5 gallons
- Number of containers: \(3.5 \times 10^2\)
First, calculate the number of containers: \[ 3.5 \times 10^2 = 350 \]
Now, divide the total gallons by the number of containers: \[ \frac{10.5 \text{ gallons}}{350 \text{ containers}} = 0.03 \text{ gallons per container} \]
Next, convert \(0.03\) into scientific notation: \[ 0.03 = 3 \times 10^{-2} \]
Thus, the final answer is: \[ \boxed{3 \times 10^{-2}} \]