Question

What is 8 percent of 10,000of 1 year

Answer 1

8% means 0.08
"of" usually means"times" in math
8% of 10,000 = 0.08 x 10,000 = 800 .

I don't understand what "10,000 of 1 year" means. 
But again, "of" usually means"times" in math.
So maybe your question means "0.08 x 10,000 x 1 year" = 800 years