Your question (Talia gave her hairdresser a 20 percent tip, which amounted to $7. What was the price of the service before the tip?) Well The answer is 35 dollars
see below how ?::
@let the real amount be x @now the amount of 20%of tip is given 7$ @we can put method , when we know that 1% is = 1/100 × a particular amount @So, let's us use it = 20/100×x=7