Question: 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? Think carefully first, then make a decision:
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 = $230. So the answer is 230.