Consider an individual with an annual income of $50,000, who allocates this income as follows: $10,000 on leisure activities, $20,000 on dining out, and $20,000 on medical expenses. The income elasticities of demand for these categories are provided as: leisure (1.0), meals (0.5), and medical care (1.5).

A. If this individual's income were to double, how would their spending in each of these categories change? Provide the new spending amounts.

B. Based on these changes, how does the proportion of their budget allocated to each category shift?