Solve for the APR
inital investment 9,500
time to double 4 years
use continuous compounding formula Pe^rt
19,000 = 9,500.e^(4r) divide both sides by 9,500
2 = e^(4r) take the ln of both sides
0.693147180=4r divide both sides by 4
r=17.33% compounded continuously=18.92% effective annual rate.
