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?
The total planned cost for the party was 100*50 = $<<100*50=5000>>5000
The total expenses for the party are 5000-500 = $<<5000-500=4500>>4500
#### 4500