Question

a man buys a book for 80 and sells it for 100.his gain%is

Answer 1

Profit= 100-80=20
% profit= (20/80)× 100
=25%
Hope I got it right.
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Answer 2

C.P.= 80.
S.P. = 100.
Gain = S.P - C.P.
= 100-80.
= 20.
Gain % = (gain/ C.P)× 100.
= ( 20/80)×100.
=( 1/4)×100.
= 25%.

Hope it helps.