Question

The selling price of 12 pens is equal to the cost price of 14 pens. Find the gain percent.

Answer 1

Let the CP of each pen be Rs.x.
Then,
CP of 12 pens=Rs.12
SP of 12 pens=CP of 14 pnes=Rs.14
now,gain=SP-CP=Rs.(14-12)=Rs.2
gain%=gain/cp*100
=(2/12*100)%= 50/3%
Hence,the gain= 16.666 is the ans

Answer 2

suppose, the SP of 1 pen is x & cp of 1 pen is y Now, the SP of 12 pens is 12x & cp of 14 is 14y
x/y = 14/12 = 7/6
now x = sp of 1 pen = 7 & y = cp of 1 pen = 6
now gain = sp-cp 7-6 = 1
gain% = gain/cp×100 = 1/6×100=50/3=16.66 Something.
I hope you understand