SOLUTION: Greg bought a television on sale for $336. The regular price was $420. What was the percent of decrease in the price? a) 80% b) 20% c) 25% d) 16%

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: Greg bought a television on sale for $336. The regular price was $420. What was the percent of decrease in the price? a) 80% b) 20% c) 25% d) 16%      Log On


   

Question 943834: Greg bought a television on sale for $336. The regular price was $420. What was the percent of decrease in the price?
a) 80%
b) 20%
c) 25%
d) 16%
Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!
if a television on sale for $336 and the regular price was $420, then the regular price was decreased by x% or x%2F100; so,
420-%28x%2F100%29420=336....solve for x
420-%28x%2F10cross%280%29%2942cross%280%29=336
420-42x%2F10=336
420-336=42x%2F10
84=42x%2F10
42x=840
x=840%2F42
x=20
so,the regular price was decreased by 20%
answer: b) 20%