how do you find the sales price on homework problems?

I’m in Pre- Algebra and i cant find the answer to this problem?
Ms. Berg bought a tent for her camping trip. The tent cost $117.00, and a 7% sales tax was added at the register. Ms. Berg gave the cashier seven $20.00 bills. How much change should she receive?

% 7×117/100=8.19 always .
seven $20.00 =140
117+8.19=125.19
so $140-$125.19 = 14.81

remember ward problems needs to be read more than once.

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