Question

a shopkeeper bought 40 cricket balls at the rate of rs 50 per ball. he sold 30 balls at the rate of 60 per ball. at what rate should he sell the remaining balls to gain 40% in the whole transaction

Answer 1

he has to sell the remaining balls at 100rs per ball to gain 40%  in the whole transaction

CP of 40 balls = 40x50 = 2000rs

30 balls are sold at 60 per ball = 30x60= 1800

To make 40% profit he has to sell them at 2000(140/100) =2800rs

Since already profit 1800 rs is made, remaining 1000 rs should be made on remaining 10 balls,
 So each ball SP should be 1000/10 = 100rs each

Answer 2

Answer:

100

Step-by-step explanation:

CP of 1 ball - ₹50

CP of 40 balls - 40×50

- ₹2000

SP of 30 ball - 60×30

- ₹1800

CP of 30 ball - 30×50

- ₹1500

Profit on 30 balls - 1800 -1500

- ₹300

profit% - 40% of CP

- 40/100 × 2000

- ₹800

Profit on 10 balls - 800-300

- ₹500

CP of 10 balls - 10×50

- 500

SP = 500+500

=1000

SP of 1 ball - 1000/10

- ₹ 100 per ball