Jasmine is ordering 3 new uniforms for work online. The 3 uniforms cost $83.97. The company charges a flat fee of $15 for shipping and handling for each order. Write an equation that relates the total cost of the order and the number of uniforms. Is the relationship proportional?

Let x be the cost of one uniform.

The total cost of the order is 3x.
The total cost of the order, including the shipping and handling fee, is 3x + 15.
The relationship is not proportional because the total cost of the order includes a flat fee for shipping and handling, regardless of the number of uniforms ordered.