The answer is: if the author is considered an expert in his or her field
In order to know the credibility of the author, you just need to conduct a quick research regarding the author's educational background and his/her working experiences. IF the educational background and the working field match the topics on the non-fiction books, that we assume that the author has a credibility.
Answer:
You would have to make sales of 13 334 USD.
Explanation:

Accra, Ghana: 5° 33' N / 02° 11' W
Algiers, Algeria: 36° 45' N / 3° 2' E
Cairo, Egypt: 30° 2' N / 31° 14' E
Cape Town, South Africa: 33° 55' S / 18° 25' E
Dakar, Senegal: 14° 45' N / 17° 19' W
Djibouti, Djibouti: 11° 49' N / 42° 35' E
Lusaka, Zambia: 15° 24' S / 28° 17' E
Nairobi, Kenya: 1° 17' S / 36° 49' E
Windhoek, Namibia: 22° 33' S / 17° 4' E
Nanchan Temple is a Buddhist temple located in the site of Wutaishan, Shanxi Province, China. It is a very important example of early Chinese architecture because its so-called Buddha Hall - an area inside the structure reserved for praying - is the oldest or earliest wooden building that still exists in China. Considering that it was built in the year 782, during the famous Tang dynasty, and that wood is a delicate material that does not stand the test of time, it certainly deserves that title.
In addition, the building preserves a set of sculptures from the same period.
Answer:
D
Explanation:
its across 4 hours but D is close enough