Albert einstein wrote a note to a bellman in 1922 on his theory of happiness when he didn’t have a tip to pay He

Question

albert einstein wrote a note to a bellman in 1922 on his theory of happiness when he didn’t have a tip to pay. He

stated basked on his notoriety and fame,’ this note would be worth more than a tip. The note just sold last fall, OCT 2017,for $3200000. Given the napkin was worth 10 cents, what is the assumed rate of retuen for this investment?

Finance