42 * $40M * 6% (average stake YC gets in company) = $100M
According to http://techcrunch.com/2013/10/25/y-combinator-13-7b-valuatio...: - YC company valuations total $13.7 Billion - 511 companies total
$11,000 + $3000 * # of founders = total investment in YC companies (let's just go with 17k for 2 founders on average) = $17K
$17000 * 511 = $8.7M
$100M - $8.7M = $91.3M
Clearly a pretty good investment =P