How many bstaffs can be bought from Zaff & the GE without losing money

battlestaves2.rb

require 'runescape'

days = 1

amount_per_day = 64
ge_limit_per_day = 600
bstaff_shop_cost = 7000
bstaff_alch_amt = 9300

battlestaff = Runescape::Item.new(1391)
air_orb     = Runescape::Item.new(573)
earth_orb   = Runescape::Item.new(575)
fire_orb    = Runescape::Item.new(569)
water_orb   = Runescape::Item.new(571)
nature_rune = Runescape::Item.new(561)

compute_set = [
  { :name => "Water", :component => water_orb, :xp => 100 },
  { :name => "Earth", :component => earth_orb, :xp => 112.5 },
  { :name => "Fire", :component => fire_orb, :xp => 125 },
  { :name => "Air", :component => air_orb, :xp => 137.5 }
]

for bstaff in compute_set do
  
  total_shop_amt = days * amount_per_day
  alch_gp = total_shop_amt * bstaff_alch_amt
  shop_cost = (total_shop_amt * bstaff_shop_cost) +
              (total_shop_amt * bstaff[:component].market) +
              (total_shop_amt * nature_rune.market)
  
  profit = alch_gp - shop_cost
  
  ge_cost_per = (battlestaff.market + 20) + bstaff[:component].market + nature_rune.market
  ge_loss_per = ge_cost_per - bstaff_alch_amt
  
  total_ge_amt = (profit/ge_loss_per).floor > ge_limit_per_day * days ? ge_limit_per_day * days : (profit/ge_loss_per).floor
  
  total_amt = total_shop_amt + total_ge_amt
  
  puts "==================="
  puts "#{bstaff[:name]} battlestaff"
  puts "==================="
  puts "#{days} days"
  puts "Shop: #{total_shop_amt} @ #{amount_per_day} per day"
  puts "GE: #{total_ge_amt} (#{total_ge_amt * ge_cost_per}gp)"
  puts "Total staffs: #{total_amt}"
  puts "GE initial investment: #{total_ge_amt * ge_cost_per}"
  puts "XP gained per day: #{(total_amt * bstaff[:xp]) / days}"
end