Answer to Question #27190 in Quantitative Methods for will colucci

Question

A candy shop puts 1000 magic green candies in a jar. After 10 years, half of the green candies turn red. After another 10 years, half of the remaining green candies turn red. This process continues until all the green candies turn red.
When you go to the shop and look in the magic candy jar, 850 candies are green. How many years have the candies been in the jar. Explain how you know, or type in any equations you used.