Conc. Term replaced by titrant|| Double reactant system

In a double star system .Find w.

Assertion: In a zero order reaction, if concentration of the reactant is doubled, half-life period is also doubled. Reason: The total time taken for a zero order reaction to complete is double of the half-life period.

A reaction is of second order with respect to its reactant. How will its reaction rate be affected if the concentration of the reactant is (i) doubled (ii) reduced to half ?