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?
How many pounds can Bobby deadlift at 18? ** His new deadlift is 300*2.5+100=<<300*2.5+100=850>>850 pounds
How many pounds did Bobby add to his deadlift? ** So he added 850-300=<<850-300=550>>550 pounds to his deadlift
How many years did it take Bobby to add 550 pounds to his deadlift? ** This took 18-13=<<18-13=5>>5 years
How many pounds did Bobby add per year? ** So he added 550/5=<<550/5=110>>110 pounds per year
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