The area of a hole in the ozone layer gets 5% bigger every year if the current area is 5 square meters how big will the hole be in 70 years

Situation: an archaelogist in turkey discovers a spear head that contains 54% of its original amount of c-14. n = noekt no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years find the age of the spear head to the nearest year