Question

if the cost price of 6 pens is equal to the selling price of 4 pens. tgen find the gain percent​

Answer 1

Soln:

Let, CP of 6 pens=SP of 4 pens=x

So,

CP of 1 pen=x/6 and,

SP of 1 pen=x/4

Now,

Gain%=[(SP-CP)/CP]×100%

=[(x/4-x/6)/x/6]×100%

=[(3x-2x)/12/x/6]×100%

=x/12×6/x×100%

=6/12×100%

=0.5×100%

=50%

Therefore, the gain is 50%.