Adam's gallery bought a photograph for $250 and marked it up $100. What was the list price?

1. The list price equals the original cost plus the amount of mark-up. 2. Substitute the known values: list price equals 250 plus 100. 3. Adding gives a list price of $350. 4. Check that this makes sense: $350 is indeed more than the original cost of $250. _Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.2 Solve Percent Applications_