Scale. One box equals 4 cm reduce the scale drawing so that it has a scale of one box equals 2 cm which shows the correct new scale drawing.
To reduce the scale drawing, we need to decrease the size of the boxes so that one box represents 2 cm instead of 4 cm.
We can achieve this by halving the size of each box.
So the correct new scale drawing would show one box equaling 2 cm.