Attack Trees

find written combo

$55$K $

open safe

$...$$

pick lock

$90$K $

learn combo

$...$$

cut open

$70$K $

install improperly

$100$K $

get combo from target

$...$$

threaten

$70$K $

blackmail$1$

$100$K $

eavesdrop

$...$$

bribe

$120$K $

listen to conversation

$20$K $

get target to state combo

$40$K $

Fill in the dots into the internal nodes of the above attack tree and thereby infer the minimal cost for the root attack $$open safe$.$

$5$