That book is not easy to carry at all times, and the calculation of the revenue, expenditure and balance it has sometimes caused an error calculation results in a waste of time to do the calculation.
This book is not easy to carry at all times and to calculate the income and balances that are sometimes caused wrong calculation, resulting in a waste of time to recalculate again.
Which book is inconvenient to carry all the time and computation expense and balance has sometimes caused calculated error causes the waste must be calculated again.