Question

naveen brought some criket balls for rs 250 for 4 balls and sold for rs 350 for 5 balls . find his gain or loss%

Answer 1

Cost price of 1 ball = 250/4 = Rs. 62.5
Selling price of 1 ball = 350/5 = Rs. 70
Gain (in Rs.) = 7.5
Gain (in %) = $\frac{7.5*100}{62.5}$
                 = 12 %
His gain is 12%.

Answer 2

The cost price of ball CP= 250/4 = 62.5 Rs
Selling price SP= 350/5 = 70 Rs
He has sold the ball at higher price
Hence the gain %= (SP-CP)*100/CP = (70-62.5)*100/62.5= 12%
His gain is 12%