a shopkeeper bought two watches for Rs.400.He sold them to gain 5% on one and loss 5% on the other. Calculate his final gain or loss percent if the selling price of both watches is the same.​

In the illustration, which two simple machines are being used to enable the student to reach the door? a. inclined plane and pulley b lever and wheel-and-axle c pulley and lever d wheel-and axle and inclined plane