Respuesta :
A. total cost of all the purchases
You can't calculate the sales tax on the sheet music or the change for $50 he would have received (which requires subtracting the total cost from $50) until you know how much the sheet music cost total.
The B) and C) options aren't relevant to the problem. You're trying to find the amount of change he gets after paying the total cost for all the sheet music + the tax on that.
You can't calculate the sales tax on the sheet music or the change for $50 he would have received (which requires subtracting the total cost from $50) until you know how much the sheet music cost total.
The B) and C) options aren't relevant to the problem. You're trying to find the amount of change he gets after paying the total cost for all the sheet music + the tax on that.