19. If there is a gain of Rs. 12 by selling an
article for Rs. 21, then find its cost price.​

1 thought on “19. If there is a gain of Rs. 12 by selling an<br />article for Rs. 21, then find its cost price.​”

1. Answer:

   gain =sp-cp

   12=21-x

   -x=21-12

   x= 9

   Step-by-step explanation:

   hope this will help you

   Reply