Question

If the profit made by selling a pen for rs. 10 is as much as its cost, what is the cost price of a pen?

Answer 1

SP = 10

PROFIT = CP

SO SP= CP + PROFIT

LET CP BE X

THEREFORE

10 = X + X

X= 5

SO CP IS RS 5

Answer 2

let the cost price of pen be x

given selling price = 10

profit= cost price

s.p. - c.p. =cp.

profit = s.p.- c.p.

10-x=x

10=x+x

x=5

cp =5