The rate constant of a first-order decomposition reaction is…

The rate constant of a first-order decomposition reaction is 0.0147 s–1. If the initial concentration of reactant is 0.178 M, what is the concentration of reactant after 30.0 seconds? (Report your answer in units of M, to 4 decimal places, i.e. x.xxxx, and no units are necessary in the answer.)