Expected short rate in the Vasicek model after ten years

A short rate $R$ starts at $R_0=r>0$ and follows the Vasicek dynamics

with positive constants $a,b,\sigma$ and standard Brownian motion $W$. Use parameters $\sigma=0.1$, $b=0.1$, $a=0.2$, $r=1$ and horizon $T=10$. First find $\mathbb{E}[R_T]$ in general, then evaluate it; the value has the form $A+Be^{C}$ with integers $A,B,C$. Report $A+B+C$.

$0$. Applying Ito to $e^{bt}R_t$ removes $R$ from the drift; taking expectations gives $\mathbb{E}[R_T]=\tfrac ab+\big(r-\tfrac ab\big)e^{-bT}$. With $bT=1$ and $a/b=2$ this is $2-e^{-1}$, so $A+B+C=2-1-1=0$.