Consider a reaction $AB$ carried out in a batch reactor. The differential equation for species $A$ is $d\frac{C}{d}t=-k{C}_A.$ The initial condition is at $t=0,C_A=1mo\frac{l}{m^3}.$ The rate constant of the reaction is $1s^{-1}.$ Using the Runge Kutta fourth order method, determine the concentration of $A$ at $3s.$