Question

a pen cost rupees 9. what are the costs of 8 pens?

Answer 1

cost of one pen =9
cost of 8 pens=9*8=72Rs.

Answer 2

if 1 pen is of rupees 9.
then, cost of 8 pens would be,
8x9 => 72

therefore, 8 pens would cost rupees 72.

hope it may help you :-)
#mark brainleist