The tax on the sale of a car in Michigan is 6%. At a dealership in Ann Arbor, a car purchase also involves $120 in miscellaneous charges. There are several quantities in this situation: the original car price, sales tax, miscellaneous charges, and total price. Write an equation to describe the relationship between all the quantities when:

The original car price is $9,500.
The original car price is $14,699.
The total price is $22,480.
The original price is p

How would each equation you wrote change if the tax on car sales is r% and the miscellaneous charges are m dollars?