Question

it's very urgent Qno 2

Answer 1

here is your answer from your friend
sp of each watch=₹99
in first case

sp of watch =99 gain%=10%
CP =(100+gain %/100)×sp
=100+10/100+99
=110/100×99
=1089/10

in second case
sp of watch =99 loss%=10%
CP =100-loss%/100×sp
=100-10/100×99
=90/100×99
=891/10
=89.1 ans