What percentage of africans live in sub-saharan africa?
a.
less than 10%
b.
about 50%
c.
about 65%
d.
about 85%

The population of Sub-Saharan Africa is about 800 million. The population of North Africa (the part of Africa that is not Sub-Saharan) is about 550 million. So the percentage of Sub-Saharam Africa is about 550 = , which is about 40 %, so the best fittign aswer is B.

Sector is best defined as (part).