How do you calculate percentage uncertainties???

I is just the uncertainty over the actual number multiplied by 100.

example:

36.1( +/- 0.1)

The percentage of the uncertainty here is 0.1/36.1x 100=0.3%

i feel your pain too because i cant find my dad and hes been missing for 17 years of my life

explanation:

he went to the supermarket with your dad

the higher the current the higher the mag field around it the higher the influence on the compass