To find out how much Mr. Roman paid for 9.3 gallons of gas at $3.30 per gallon, you can multiply the number of gallons by the price per gallon:
\[ \text{Total Cost} = \text{Number of Gallons} \times \text{Price per Gallon} \]
\[ \text{Total Cost} = 9.3 , \text{gallons} \times 3.30 , \text{dollars/gallon} = 30.69 , \text{dollars} \]
So, Mr. Roman paid $30.69 for 9.3 gallons of gas.