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A concession stand vendor counts the money in the register. After 1 h, it has $42.75. After 5 h, it has $260.75. How much money will be in the register at the end of an 8-hour shift?

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Hagrid
A concession stand vendor counts the money in the register.
 => 1 h, it has $42.75.
=> 5 h, it has $260.75.
260.75 - 42.75 = 218 are added to the money after 4 hours
=> 218 / 4 hours = 54.5 per hour
=> 54.5 * 3 additional hours = 163.5
=> 163.5+260.75=424.25