If you are thinking which products you should use, there are four primary things which should be taken into account for the determination of cost per interview.
Nga murahu ni haseledze na vhana vhaṱuku vhe tshiṱeidzhini, mbudziso dzi tevhelaho: Ndi afhio maga maṋa ane ra fanela u a tevhela musi ri tshi lugiselela zwine ra ḓo zwi fhindula miṱanganoni?