I think Hillary's campaign spent $1.8 billion total on political ads. CBS says that a total of $6.8 billion was spent on political ads during the 2016 US federal election campaign, which would make the $100k of ads in question equal 0.00147% of the total spent on ads during the election campaign.
.
Except, Facebook says the $100k of ads in question were non-political, and 56% of them ran AFTER the election, while of those that ran before the election, most ran in 2015, a very long time before the election.