Can someone help please i really need this

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Solve the equation x/4 - 5= -8 -27 -12 -7 12

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost