At the peak (also denoted as UTS) of an engineering stress vs. engineering strain curve for ductile metal, the engineering strain is $0.2$. The corresponding true stress $(\sigma)$ vs. true strain ( $\epsilon$ ) relationship follows the equation: $\sigma=K \epsilon^{n}$, where $K$ and $n$ are constants.
The engineering stress at the peak in $\mathrm{MPa}$ is $\_\_\_\_$ (rounded off to one decimal place).
Given: $K=200 \mathrm{MPa}$
