Barbie Bungee Data Estimates

My estimate for the drop of a barbie with 10 rubber bands is going to be at least around 140 cm because every time we drop the barbie it will double or be more then the first try you did. My estimate for the drop with the 20 rubber is at least around 160/170cm because every time I did that experiment that drop will always double the (cm). For the drop of the barbie with 30 rubber it's at least going to be around 200cm or 210cm depending how many times you do it.