When Mariam's income increased from RM1,500 to RM2,000 a month, she increased her demand for chicken chops by 20% and decreased her demand for tomyam by 30%. Calculate Mariam's elasticity for both products and comment on the nature of the items.

If the tomyam's price decreased by 10% and chicken chop's price increased from RM10 to RM15, calculate the elasticity of both products. What can be concluded based on the results?