interest_rates   = 0.001 : 0.001 : 0.027;
days             = log(2)  ./ log(interest_rates + 1);
trading_days_pa  = 260;
yearly_return    = (interest_rates + 1) .^ trading_days_pa;
interest_rates .*= 100;
yearly_return  .*= 100;

subplot(3, 1, 1)
plot(interest_rates, yearly_return)
title('Jahres-Rendite')
xlabel('Rendite / % pro Tag')
ylabel('Rendite / % pro Jahr')
grid('on')

subplot(3, 1, 2)
plot(interest_rates(1 : 10), yearly_return(1 : 10))
title('Jahres-Rendite (bei vielleicht noch sinnvollen Werten)')
xlabel('Rendite / % pro Tag')
ylabel('Rendite / % pro Jahr')
grid('on')

subplot(3, 1, 3)
plot(interest_rates, days)
title('Zeit zur Kapital-Verdoppelung')
xlabel('Rendite / % pro Tag')
ylabel('Tage')
grid('on')