Monthly Expenses Based on Utility Usage

Alex is working on a linear model to predict his monthly expenses based on his utility usage. He has recorded his utility expenses over several months and created the following linear function:

$$ y = 75 + 20x $$

In this equation, y represents the total monthly expense in dollars, and x represents the number of hundred kilowatt-hours of electricity consumed.

If Alex used 8 hundred kilowatt-hours of electricity in a month, what will be his total monthly expense?