Bobby can deadlift 300 pounds at 13. When he is 18 he can deadlift 100 pounds more than 250% of his previous deadlift. How many pounds did he add per year? Let's be accurate as possible.
His new deadlift is 300 * 2.5 + 100 = 850 pounds. So he added 850 - 300 = 550 pounds to his deadlift. This took 18 - 13 = 5 years. So he added 550 / 5 = 110 pounds per year.
The answer: 110.