I need to figure out how many gallons sold at what price and what the total
dollor amount is for gallons total under a set price.

I have some experiance with formulas but I think this one I need help with.

Example:
Gallons|Price|Total Gallons|Total Gallon Price|
a2 b2 c3 d4
100 1.899 350 664.65
150
100