class Array

# File lib/invoice/array.rb, line 2
def snapshots
  self.find_all{ |row| (row['UsageType'].scan /:(.+)$/).flatten.first == 'SnapshotUsage' }
end

# File lib/invoice/array.rb, line 6
def total_price
  total = 0
  self.each{ |row| total += row['TotalCost'] }
  total.round(2)
end