That it is not easy to carry and to calculate the revenue-expenditure balance and find it has sometimes caused an error calculation results in a waste of time to do the calculation.
Which it is not easy to carry at all times and to calculate revenue - expenses and finding a balance that has sometimes caused wrong calculation causes time to recalculate again.
It is inconvenient to carry all the time and computation expense and finding the balance that has sometimes caused calculated error caused a waste must be calculated again.