The Sweet Auburn Historic District is an important part of Atlanta History because

Concentrated along a short mile and a half of Auburn Avenue, the Sweet Auburn Historic District reflects the history, heritage and achievements of Atlanta's African Americans. The name Sweet Auburn was coined by John Wesley Dobbs, referring to the "richest Negro street in the world." Like other black communities throughout the country, Sweet Auburn's success was intricately tied to the residential patterns forced on African Americans during the early 20th century--the result of restrictive laws in southern states which enforced segregation of the races, known as Jim Crow laws. It was here that many African Americans established businesses, congregations, and social organizations.

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Sweet Auburn Historic District reflects the history, heritage and achievements of Atlanta's African Americans. ... It was here that many African Americans established businesses, congregations, and social organizations.

Explanation:

in this question, we use the simple interest formula, which is

and it is given that

therefore,

so for the given question, and with the given values of p, r and t, the interest that he earns in that time is $78.75