Creating ranges for multipliers

I am attempting to create a formula for a project. The multipliers I use will be based off of # of units used. So lets say I have 500,000 units. The first 100,000 would be multiplied by 9.3, 100,000.01 - 250,000 would be multiplied by 9.5 and 250,000.01 - infinite be multiplied by 9.7. I know I can created different cells, but wanted to see if this could be done with one formula. I tried using sumif but that doesnt appear correct. Any help would be appreciated. Thank you.