Question

last year the cost of 1000 articles was Rs : 5000. this year this goes down to Rs: 4000 . what is the percentage of decrease in price

Answer 1

cost of 1000 articles in last year=5000
cost of 1000 articles in this year=4000
therefore,the percentage of decrease in price=
5000
-
4000
________
___1000_____

Answer 2

Last year

cost of 1000 articles=5000

$cost \: of \: 1 \: article = \frac{5000}{1000}$

this year

cost of 1000 articles =4000

$1 \: articles = \frac{4000}{1000} \\ = 4 \\ decrease \: amount \: = 5 - 4 = 1 \\ percentage \: = \frac{changed \: amount}{original \: amount} \times 100 \\ = \frac{1}{5} \times100 \\ = 20\%$