LOAN?

math.rb

#!/usr/bin/env ruby

INPUT = 1.0
RATE  = 0.000355
DAYS  = [1, 2, 3, 7, 14, 30, 60, 90, 180, 364]

DAYS.each do |days|
  out = INPUT
  days.times do |i|
    out += out*RATE
  end

  puts "[#{days}]\tIN #{INPUT} / OUT #{'%.8f' % out} : +#{'%.8f' % ((out/(INPUT/100))-100)} %"
end

result.txt

[1]     IN 1.0 / OUT 1.00035500 : +0.03550000 %
[2]     IN 1.0 / OUT 1.00071013 : +0.07101260 %
[3]     IN 1.0 / OUT 1.00106538 : +0.10653781 %
[7]     IN 1.0 / OUT 1.00248765 : +0.24876481 %
[14]    IN 1.0 / OUT 1.00498148 : +0.49814846 %
[30]    IN 1.0 / OUT 1.01070500 : +1.07050030 %
[60]    IN 1.0 / OUT 1.02152460 : +2.15246030 %
[90]    IN 1.0 / OUT 1.03246003 : +3.24600269 %
[180]   IN 1.0 / OUT 1.06597371 : +6.59737071 %
[364]   IN 1.0 / OUT 1.13791435 : +13.79143496 %