Online lessons are billed at $1 per minute.
In-person lessons are an additional $15 for travel time and expenses.
ie. a half hour online lesson is $30 and a half hour in-person lesson is $45 ($30 + $15)

To accomodate households with multiple students, these familes are billed per time, NOT per student.
A half hour in-person lesson is billed at $45, but two half hour lessons within the same household is not billed at $90 ($45x2).  
Instead, the family will only pay for the time the teacher is there.  They would be billed $75 for the two half hour lessons, no different than a regular 1 hour lesson.