Ukhilimu wekhofi, noma ukhilimu wetafula – uqukethe u-18% wamafutha obisi. Ukhilimu ophehlwa – uqukethe noma yikuphi kusuka ku-33-36% wamafutha obisi, futhi usetshenziselwa ukwenza ukhilimu ophehliwe.

Umkhiqizi wephrinta yekhofi