To calculate the amount Kelsey made in tips, you need to find 18% of the total receipts of $360.
First, convert the percentage into a decimal: \[ 18% = \frac{18}{100} = 0.18 \]
Now, multiply the total receipts by the tip rate: \[ \text{Tips} = \text{Total Receipts} \times \text{Tip Rate} = 360 \times 0.18 \]
Calculating this: \[ 360 \times 0.18 = 64.8 \]
Thus, Kelsey made $64.80 in tips that night.