Answer:
He sold them to gain 10% on one and loss 10% on the other. Calculate his final gain or loss percent if the selling price of both the mobile sets
Explanation:
.
Discuss the problems in a calm respectful manner.
From my personal life I'd say B is what I have lived by since I started working out, I also think schools would say the same, I am not %100 sure but this is my input.