Question

amit bought a book self for 690 and then spent 210 for polishing it. she sold it for 1000. what is gain or loss

Answer 1

gain =sp - cp
1000-(690+210)
1000-900=100rs

Answer 2

He get a profit of 100 rs
I.e.
Gain = S.P.-C.P.
= 1000-(690+210)
= 1000-900
= 100