Hally and her friends organized a high school reunion

Hally and her friends organized a high school reunion. To cover the cost of a late-night party that they planned for at the reunion, each attendee had to pay $100. After the party, Hally and her friends realized that the total expenses were $500 less than the total contributions. If there were 50 people at the party, how much money was used to pay for the party expenses?

GSM8K — Grade School Math 8K (Cobbe et al., OpenAI, 2021) · train #494