John bought a cell ohone for $99 and the 7% sales tax was added at the register. he gave the cashier six $20 bills. how much change should he receive

So in order to solve this you would multiply 99 by. 07 and get 6.93 so therefore you add the 6.93 to 99 and get 105.93 Then you add together all the bills wich is 120 and subtract 120 - 105.93 wich equals 14.07 sot to answer your question John shall recieve $14.07 in change