Shreyans Malani: 5.057%
Chinmay Sangoram: About 5 – 5.5%
David Geof: no one has right answer yet – hint use geometric mean
Lawrence Tedeschi: That is the right formula, and all the numbers are correct..
David Geof: Ignore my previous comment – Shreyans got it right first. Bonus internet points for you and slap on wrist for me for doing calculations over lunchtime beers 😉
Khetran Hashmat Khan: 5.04%