While dean was visiting his sister in belleville, he bought a rug that was marked down 60% from an original price of 25. if the sales tax in belleville is 10%, what was the total cost of the rug

Can someone plz me understand how to do these. plz, show work.in exercises 1-4, rewrite the expression in rational exponent form.[tex]\sqrt[4]{625} \sqrt[3]{512} (\sqrt[5]{4} )³ (\sqrt[4]{15} )^{7}\\ (\sqrt[3]{27} )^{2}[/tex]