Question

A dealer sold a camera for Rs.1080 gaining 1/8of it's cost price.find cost price of the camera and the gain percent earned by the dealer.

Answer 1

cost price =x
Selling price =1080
profit=x/8
selling price=x+x/8=9x/8
1080=9x/8
1080=9x/8
x=960

Answer 2

A dealer sold a camera for Rs.1080

gaining 1/8of its cost price then the cost price of the camera as well as the gain percent earned by the dealer will be  in general

the Selling price=1080,

let cost price=C

therefore gain=1/8C and the Selling price=C+1/8C=1080

by solving C we have:9/8C=1080

then C=960

and gain =1/8*960=120

and the percentage gain=120/960*100%=12.5%