Respuesta :
30 dollars
If she received 30 dollars in change then she paid with a 100 dollar bill
If she received 30 dollars in change then she paid with a 100 dollar bill
We do not know the exact anwser to that since we don't know the profit and theft margins and the fixed and variabel costs.
But if we do not count the above, 100 dollar
But if we do not count the above, 100 dollar