To calculate the amount of work Lydia is doing on each orange, you need to use the formula for work, which is Work = Force x Distance x Cos(theta). In this case, the force is the weight of the orange (1 kg), the distance is the height of the table (1.5 meters), and theta is the angle between the force and the distance (which is assumed to be 90 degrees, since she is lifting the orange straight up).
So the work done on each orange is 1 kg x 1.5 meters x cos(90) = 1.5 Joules.