Type I error of a uniform max test

Let $X_1,X_2,…,X_{10}$ be i.i.d. $\mathrm{U}(0,\theta)$ random variables, where $\theta>0$ is unknown. For testing the null hypothesis $H_0:\theta=1$ against the alternative hypothesis $H_1:\theta=0.9$, consider a test that rejects $H_0$ if $X_{(10)}=\max\{X_1,…,X_{10}\}<0.8$. Then the probability of type I error of the test is equal to __________ (round off to 2 decimal places)