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First Author:
 
Andrew Phiri
North West University (Potchefstroom Campus)
phiricandrew@yahoo.com
 
A. Phiri, School of Economics, North West University, Private Bag X6001,
Potchefstroom, 2520, South Africa
 
 
 

Second Author:

Peter Lusanga
North West University (Potchefstroom Campus)
20878346@nwu.ac.za
 
Faculty of Engineering, Faculty of Engineering, Private Bag X6001,
Potchefstroom, 2520, South Africa