Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
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?

### Response:
 Gharama jumla zilikuwa $500 chini ya michango jumla.
Hivyo, michango jumla ilikuwa $500 zaidi ya gharama jumla.
Ikiwa kulikuwa na watu 50 kwenye chama hicho, michango jumla ilikuwa 50*100 = <<50*100=5000>>5000.
Hivyo, gharama jumla zilikuwa 5000 - 500 = <<5000-500=4500>>4500.