Scientists have been conducting a study for the past ten years with native blackberry bushes. They have determined that wild blackberries experience exponential growth when allowed to grow unchecked. At the beginning of the study, they gathered exactly 100 berries from the bushes. After ten years of growth, they gathered 21,400 berries. If the growth continues at the same rate, how long will it take (from the start of the study) before they are able to gather 500,000 berries? 32.3 years ($15.9 years 21.3 years 12.1 years