Question

John paid 5% sales tax on his television, which cost $769 before taxes. What did the television cost in total?

Answer 1

For this case we can make the following rule of three:
$ 769 ---------> 100%
x --------------> 105%
From here, we clear the value of x.
We have then:
x = (105/100) * (769)
x = 807.45 $
Answer:
the television did cost 807.45 $ in total