You can correct me if I'm wrong with the exact 2x profit. I make no assumptions that I am 100% correct.
Upvotes are calculated from USD value. 0.05 STEEM is worth $0.79*0.05=$0.0395.

So to get a 2x upvote this is worth $0.079. You received $0.082 upvote which is 2.1x profit.