That's function doesn't make sense, or doesn't fit the problem.
B(7) = 4 * e^(.08*7)
B(7) = 4 * e^0.56
B(7) ≈ 7
Please double-check the wording and the equation again.
Update: You appear to have transcribed the growth rate incorrectly --> .08 should be 0.8.
Answer:
B(7) = 4 * e^5.6
B(7) ≈ 1081.7056
Answer:
b. 1082
