Question

S.P of 10 articles is equal to C.P of 11 articles find gain percentage

Answer 1

Let the cost  price of  one  article   is  Rs.  100
Then  cost  price of  11 article  is  Rs. 100 X 11 = Rs. 1100

According  to  question
Selling  price  of   10  article  = Cost  price  of  11 article(Rs 1100)
Selling  price  of  1  article = Rs. 1100/10 = Rs 110

Gain %  =  110 -100  = 10%

SHORT  TRICK  ={ (No. of  cost article/No. of selling article)X 100 } - 100
If  the  answer  is   positive  then  there  is  gain  and  if   answer  is  negative   then  there  is  loss

In  this  question  Ans {(11/10) X 100} -100 = 110 -100