Trip Cost Sharing Problem

Sarah is planning a trip to the mountains with her friends. They decide to rent a cabin that costs a total of $600 for the weekend. Sarah, being considerate, wants to ensure that everyone contributes fairly to the cost of the cabin. She has 4 friends who will be joining her.

In addition to the cabin fee, Sarah plans to buy groceries and supplies for the trip, which are estimated to cost $120. When she divides the total trip cost among her friends, she wants each person to pay an equal share.

If Sarah insists on paying an initial deposit of $100 herself, how much will each friend need to pay to cover the total costs?