The phone company charges 10cents to connect a call for 1 min and 8cents after that . How long could you talk for $1

Question

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Answer 1

Solve for t in:

 

100 cents = (10 cents) + (8 cents/min)(t - 1)

 

100 = 10 + 8(t - 1)

 

t = [(100 - 10)/8 + 1] min = 12.25 min

 

$1 gets you 12.25 min