Hello, I am in the process of doing my contract with the reception venue and they are charging me 20% service charge and 6% sales tax. How should i calculate this to get the total amount? Is it 20% of the price and the 6% of the result? Or do you calculate the 20% of the original price and then 6% of the original price and add them together? Help! I am so confused and i dont want to be paying taxes double or getting scammed for more money due to lack of knowledge in these things?