Solve the Exponential Equation $100,000 = 50,000 e ^ { 25 r }$

Multiple Choice

Solve the exponential equation $100,000 = 50,000 e ^ { 25 r }$ for r to determine the interest rate required for an investment of $50,000 to double in value when compounded continuously for 25 years. Round your answer to one decimal place.

A) 2.5%
B) 3.9%
C) 6.4%
D) 2.8%
E) none of these