Looks like they've been calculated additively. The figures should be more like:biffvernon wrote:Thanks Ralph, that's a useful line of thought but is the sunshine affecting my arithmetic or is there something wrong with those numbers?RalphW wrote:5% a year, giving 50% in ten years (2020).
7% average decline due to lack of new investment 50% in 7 years, 2016.
At 5%
1yr - 95%
2yr - 90.25%
5yr - 77.4%
10yr - 59.9%
13yr - 51.1%
At 7%
1yr - 93%
2yr - 86.5%
5yr - 69.6%
9yr - 52%
10yr - 48.4%