# Jensen’s inequality in Convexity adjustment premium

I'm preparing for my FRM II test in May. Could someone help to explain where does the 0.0823 come from? 😥

$$P_2-P_1$$ where:
$$P_1=\frac{1000}{\left(1+\frac{0.06+0.04}{2} \right)\left(1+0.05 \right)}$$
$$P_2=0.5\frac{1000}{\left(1+0.06 \right)\left(1+0.05 \right)}+0.5 \frac{1000}{\left(1+0.04 \right)\left(1+0.05 \right)}$$