Question

if cost price of 12 p e n is equal to selling price of 9 p e n find profit%​

Answer 1

let the sp of 9 pen be x

then sp of 1 pen=x/9

and cp of 12 pen= x

hence, cp of 1 pen =x/12

ATQ,

profit=sp-cp

= (x/9)-(x/12)

=(4x-3x)/36

= x/36

profit%= profit/cp*100

= x*12*100/x*36

= 100/3%

= 33.33.....%