If the cost of the television is reduced by 25% thst means you pay 75% so the cost of the television can be multiplied by .75 to get the cost payed for beforeign tax. Since the tax is being added to the cost you can multiply your previous answer be 110% which is 1.10. Written out this problem looks like:
80×0.75=60
60×1.10=$66
So the final answer is $66