Materials refer to all durable and non-durable materials items required by the office to perform all its activities, accurate and systematic manner. There are durable and non-durable materials.
Durable materials are those materials which help to generate regular incomes for an organization.
Non- durable materials are those materials which are used for the purpose of manufacturing or selling or operating office and administrative activities.
The revenue which is earned by selling and distributing goods and services on a regular basis is called sources of income.There are two sources of income regular and other income sources.
Regular incomes are those incomes which are earned by selling goods and rendering services.
Other incomes are those incomes which are not earned regularly. These are the incomes other than regular incomes.