Answer:
I would assume 204bpm because you'd double the 50% bpm to make the maximum bpm.
Explanation:
Only use this answer as a last resort, it's been awhile since I worked on heartbeat and pulse topics. I was also not very good at it in the first place.
Answer: Ambulatory monitoring of the electrocardiogram in 100 healthy 14 to 16 year old boys showed heart rates ranging from 45 to 200 beats/minute during the day and from 23 to 95 beats/minute during sleep.
I believe it would be unrealistic goals, because then you would be pushing yourself harder when your body shouldnt be working that hard.