He reminds me of a governmental expert who said yesterday
on Foxnews: Since the successful kill rate for our anti-ICBM
missiles is 60%, we have to fire two of them to be sure we
shoot it down. :-) (After all 60% + 60% = 120% and wouldn't
that be overkill?) :-)

84%. the "expert" might borrow a copy of Innumeracy.

the astute reader will note that this figure may not work in the real world.

Gravity