Question

please solve this question

Answer 1

Let the CP of one article = Rs. C and SP = Rs. S

21C = 18S 
C = (6/7)S 
C < S = Profit

Formula : SP = (100 + P% / 100) CP

S = (100 + P% / 100 ) C

S/C = (100 + P% / 100 )

7/6 = (100 + P% / 100 )

7/6 X 100 = 100 + P%

700/6 - 100 = P%

100/6 = P %

P % = 16.67
plss mark me as brainly

Answer 2

let cp of one article is 10rupees
cp of 18 articles is 180rupees
So sp of 21 articles is 180rupees
cp of 21 articles is 210rupees
Therefore loss is 210-180 which is 30
loss percentage is 30/210*100
which is 100/7
Therefore ans=14.28%=14.3%