Stock spread option maximum loss and profit calculation

spread.rb

def break_even(long_sp, short_sp, ndp)
  if long_sp > short_sp # bear option
    long_sp - ndp
  else # bull option
   long_sp + ndp
  end
end

def max_profit(long_sp, short_sp, ndp)
  if(long_sp > short_sp) # bear option
    bear_diff = long_sp - short_sp
   else # bull option
    bear_diff = short_sp - long_sp
   end
   (bear_diff - ndp).round(2) * 100
end

def calc(long_strike, short_strike, long_p, short_p)
  bear_diff = long_strike - short_strike
  bull_diff = short_strike - long_strike
  net_debit_paid = long_p - short_p
  breakeve_price = break_even(long_strike, short_strike,net_debit_paid)
  #max_profit = (bear_diff - net_debit_paid).round(2) * 100
  max_profit = max_profit(long_strike, short_strike, net_debit_paid)
  max_loss  = (net_debit_paid * 100).round(2)
  puts "*******"
  puts "Breakeven price: #{breakeve_price}\n Max Profit: #{max_profit}\n Max Loss: #{max_loss}"
end

def help
  "ruby spread.rb long_strike short_strike long_price short_price"
end

# formula: https://youtu.be/Npx2j_bHwnM?t=685
puts "USAGE: #{help}"
calc(ARGV[0].to_f, ARGV[1].to_f, ARGV[2].to_f, ARGV[3].to_f)

ruby spread.rb 128 132 4.93 2.13

USAGE: ruby spread.rb long_strike short_strike long_strike_price short_strike_price
*******
Breakeven price: 130.8
 Max Profit: 120.0
 Max Loss: 280.0