A Roadbed Rises 250 Ft for Each 2800 Ft of Horizontal

Multiple Choice

A roadbed rises 250 ft for each 2800 ft of horizontal. (See the illustration.) Find the angle of inclination of the roadbed. (This is usually referred to as % of grade.) Round your answer to the appropriate number of significant digits.

A) 7.8 ^o
B) 5.1 ^o
C) 6.7 ^o
D) 6.4 ^o
E) 6.2 ^o