The demand for dental care is presented. Participants on the free plan visited the dentist annually is 58% and 75% in each income group. Dental care utilization Low-income group High-income group Percentage with any use Percentage with any use Free 58% & 75% 57.8% 74.7% 95% copayment* 39.8% 61.3% *Copayment rate refers to the fraction of the medical bill for which the patient is responsible. Explain the income group that has more elastic demand for dental care on free plan (4 points; at least 30 words) Explain the income that has more elastic demand for dental care when copayment rate increases (4 points; at least 30 words)