Answer
${{\$}} 42,395.90$
Work Step by Step
Contiuous compounding is modeled by $A=Pe^{rt}$.
Here, $P=2000, r=0.31, t=10$
$A=2000e^{0.31(10)}\approx 44395.90256$
The interest earned is the difference
$44,395.90-2000={{\$}} 42,395.90$