DON'T PUT A NUMBER ON THE PRICE TAG IF THAT NUMBER ISN'T THE AMOUNT YOU PAY AT THE REGISTER.
I DON'T CARE ABOUT THE TAX.
I DON'T CARE ABOUT HOW MUCH MONEY FROM THE SALE GOES TO YOU PERSONALLY.
I CARE ABOUT HOW MUCH MONEY I WILL HAVE TO PAY TO BUY THE THING I WANT TO BUY.
THAT IS THE IMPORTANT NUMBER.
PUT THAT NUMBER ON THE PRICE TAG.