A new car usually costs £8500. Henry gets a discount of £1000. What is the discount as a percentage of the the usual cost? Give your answer to 1 decimal place. Please help.

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]