In the formula A=Ie^kt, A is the amount of radioactive material remaining from an initial amount I at a given time t, and k is the negative constant determined by the nature of the material. An artifact is discovered at a certain site. If it has 52% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.0125% annually.) (Round to the nearest year)

If some one could please help i need this as soon as possible !!! URGENT! :confused: