Proposed investment improvements

While we are at investment, let me suggest yet another improvement: a "bank commission" entry representing the 10% for the bank. Sure, even a junior high school pupil can divide by ten but this is still more visible and it will make it even more self-explanatory, so less reactions like "what is your business model" and "scammer, where is my money?"

To continue on voidspasm proposal, how I suggest to implement it (if you dedice to):
- a checkbox which, when checked, also enable a percentage field (which defaults a 100%).
- the field remembers the last percentage value when unchecked.
- the whole line is greyed out when unchecked.
- divest benefits applies as soon as the box is checked, so no confusion like a checked box without divesting benefits.
- divesting is retroactive (if you can to offer the option, you can add a second checkbox checked by default and called "[ ] retroactive", though, which in that case is greyed out like Divest benefits [ ] % when "Divest benefits" is not checked).


Example:
(bank roll of 45K)

Investment   Percentage   Gross profit  Bank commission (10%) Net profit
1000           2,22%          22            2,2                  19,8

[ ] Divest benefits [ ] %      [ ] retroactive