Numerical Methods: Euler to Runge–Kutta · Easy problem

In one classical Runge–Kutta (RK4) step for $y' = t^2 + y$ from the point $(t_0, y_0) = (1, 2)$ with $h = 0.2$, the first two stages are $k_1 = f(t_0, y_0)$ and $k_2 = f\!\left(t_0 + \dfrac{h}{2},\ y_0 + \dfrac{h}{2} k_1\right)$. Find $k_2$. Express your answer as a decimal.