Edward C. answered 03/13/15
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Caltech Grad for math tutoring: Algebra through Calculus
Break up the call into 2 time periods, 7-8 and 8-8:30.
From 7-8 is 60 minutes at 0.05 per minute times 1.5 for conference equals
60*.05*1.5 = 3*1.5 = $4.50
From 8-8:30 is 30 minutes at 0.03 per minute times 1.5 for conference equals
30*.03*1.5 = 0.9*1.5 = $1.35
The total cost is $4.50 + $1.35 = $5.85