On Tuesday 27% of the customers who bought gas at a gas station made additional purchases. There were 300 customers who bought gas. How many of these 300 customers made additional purchases?

To find the number of customers who made additional purchases, we need to multiply the total number of customers by the percentage of customers who made additional purchases as a decimal:

300 x 0.27 = 81

Therefore, 81 of the 300 customers made additional purchases.