Question 943834
if a television on sale for ${{{336}}} and the regular price was ${{{420}}}, then the regular price was decreased by {{{x}}}% or {{{x/100}}}; so,

{{{420-(x/100)420=336}}}....solve for {{{x}}}

{{{420-(x/10cross(0))42cross(0)=336}}}

{{{420-42x/10=336}}}

{{{420-336=42x/10}}}

{{{84=42x/10}}}

{{{42x=840}}}

{{{x=840/42}}}

{{{x=20}}}

so,the regular price was decreased by {{{20}}}%

answer: b) {{{20}}}%