def deposits
    deposits = business_day.deposits.find(:all, :conditions => 'amount < 0')
    deposits.collect(&:amount).sum
  end

  def withdrawals
    deposits = business_day.deposits.find(:all, :conditions => 'amount > 0')
    deposits.collect(&:amount).sum
  end

  def pennies_to_register
    additions = business_day.additions.find(:all, :conditions => 'amount > 0')
    additions.collect(&:pennies).sum
  end

  def pennies_to_safe
    additions = business_day.additions.find(:all, :conditions => 'amount < 0')
    additions.collect(&:pennies).sum
  end

  def pennies_deposits
    deposits = business_day.deposits.find(:all, :conditions => 'amount < 0')
    deposits.collect(&:pennies).sum
  end

  def pennies_withdrawals
    deposits = business_day.deposits.find(:all, :conditions => 'amount > 0')
    deposits.collect(&:pennies).sum
  end