Arecipe for chocolate chip cookies used 3 cups flour and sticks 2 sticks of butter is the amount of butter used proportional to the number of cups of flour used.

I believe so. 
Because if we make x flour, and y butter. 
If you doubled or tripled the recipe the x and y would have to increase. And every time x increases y will also have to increase. 

I hope this helps you.

Where is the problems

It is 198,87032,750 + 375 = 33145 so, we take the 6% and we make it a decimal (0.6) and multiply that, then that is your answer