Hypothesis Tests · Easy problem

A machine's fill volumes have known $\sigma = 15$ mL. To test $H_0\!: \mu = 100$ against $H_a\!: \mu > 100$ at $\alpha = 0.05$ with a sample of 25, we reject $H_0$ when $\bar x > c$. Using $z^* = 1.645$, find $c$. Give the exact decimal.