There's an online sale where you get $10 for every $100 that you spend. If you make a purchase of $250 before discounts, how much did you end up paying?
If for every $100 spent I save $10, then for $250 spend I'd save $10*2=$20
If my total was $250, then I ended up paying $250-$20=$<<250-20=230>>230
#### 230