Plant Growth Analysis with Compounds

A research scientist is analyzing the effects of two chemical compounds on plant growth. Compound X enhances growth by a factor of 1.5, while Compound Y reduces the growth factor to 0.75. The scientist applies Compound X to a control group of 40 plants and Compound Y to another group of 40 plants. The initial average height of the plants in the control group is 20 cm, whereas the initial average height of the plants treated with Compound Y is 25 cm. After a month, the heights of the plants in each group are measured. What is the average height of the plants for each group, and what is the difference in average height between the two groups after applying the respective compounds?