List price, discounted price , final cost , sales price - Very Tricky Concept

GRE Quant Problem Solving
1

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Can someone pls explain whether my understanding is correct or not?

List price is 300
We need to subtract discount of 15% on the list price which comes as 45.
255 (300-45) is what?? Is that the discounted price? or the sale price?
Sales tax of 6% should be always on the discounted price or the sale price?

Final cost is what? is that the sale price?

2

255 is the discounted price

Add 6% to get the final cost.

Go slowly with the verbiage to understand it.

3

We need to reduce 6% sales tax

4

Nope, it is understood that tax with be added and not reduced like a discount.