People living in Africa marked the transition to which age?

Late Stone Age ( I don’t know if this is what you mean though)

The transition from the Middle Stone Age to the Late Stone Age is thought to have occurred first in eastern Africa between 50,000 and 39,000 years ago. It is also thought that Late Stone Age peoples and/or their technologies spread out of Africa over the next several thousand years.
I looked this up in my history book. I hope this helps

17/100×15.30=2.60

9/100×15.30=1.37

15.30-(1.37+2.60)=11.33