Answer and Explanation:
As in the question it is mentioned that GDP grow at 3% annually and the health spending is also grow at 1% so the growth rate would be 4%
Now the GDP for the year 2064 is
= Share of health spending × (1 + growth rate)^time period
= 0.18 × (1 + 0.04)^48
= 1.18%
As it can be seen that the share of health spending is higher in the year 2024 so it would be warranted and highest share that contains no problem