Mathematics, 24.04.2020 05:21, cameronbeaugh

Sarah’s party costs $600 for up to 30 people plus $40 for each extra person. Sarah’s party cost $1600 in all. How many people came to the party?
(The answer is 55 but I need step by step help on how to solve it)

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Sarah’s party costs $600 for up to 30 people plus $40 for each extra person. Sarah’s party cost $160...