Answer:
28%
Step-by-step explanation:
Provided information
Purchase value of local artist's painting = $2,100
After several years, the sale value would be $2,700
Given tax bracket = 12%
Since there is a purchase and sale transactions of local artist's painting which reflects the capital gain that would be a long term capital gain
So, the tax rate should be 28%, not 12% and at this rate the gain is to be taxed.