# Gavin Andresen
# 2012-03-18 17:14:15
# https://bitcointalk.org/index.php?topic=69230.msg807933#msg807933

@s{quotedtext}
@s{quotedtext}
 @p{brk}
Check your math@p{--} to get 51% you'll need to dedicate six times as much hardware to hashing as it takes to get 15%: @p{par}

The formula for what fraction of existing hashing power you need add to get X% of the network is: @p{brk}

Code:
H = X / (1-X)
 @p{brk}
To get 15%, you need to add 17.6%.  E.g. if existing hashing power is 100, then you add 17.6 more and your fraction is (17.6/117.6) = 0.15. @p{par}

To get 51%, you need to add 104%.  E.g. if existing hashing power is 100, then you add 104, then your fraction is (104/204) = 0.51. @p{par}

104 is six times as much as 17.6. @p{brk}