Question

if a person buy 8 pen in 9 rs and sells 9 pen in 8 rs then person gets profit or loss

Answer 1

Cost price of 8 pens = Rs. 9
Therefore, cost price of 1 pen = Rs. (9÷8) = Rs. 1.125 or Rs. 1.13 (approx.)

Selling price of 9 pens = Rs. 8
Therefore, selling price of 1 pen = Rs. (8÷9) = Rs. 0.88 or Rs. 1 (approx.)

Since CP > SP,
Therefore, it is LOSS.