Question 935221

let the original price be {{{x}}}

if {{{4200}}} is {{{20}}}%={{{0.20}}} off the final price, means {{{0.20x=4200}}}

the original price was {{{x=4200/0.20}}}=>{{{x=21000}}}

the final price be {{{x-0.20x=21000-4200=16800}}}