Max is saving $10 a month for a summer vacation. If he also has $50 from his grandmother, how many months will Max need to save to have a total of 200? Choose the equation that represents this situation.

1. 50m + 20 = 200
2. 50m - 10 = 200
3. 10m - 50 = 200
4. 10m + 50 = 200​