Jim pays $75 per month for a cell phone plan plus $0.30 per minute beyond the first 1000 minutes. His bill was $105.60 last month. How many minutes did he use?

1102 minutes

Let ##x## be the number of minutes Jim used
##105.60 = 75 + 0.30(x – 1000)##
##=> 105.60 = 75 + 0.30x – 300##
##=> 105.60 = 0.30x – 225##
##=> 1056 = 3x – 2250##
##=> 1056 + 2250 = 3x##
##=> 3306 = 3x##
##=> x = 1102##

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