Leomarich F. Casinillo Department of Mathematics, Visayas State University, Visca, Baybay City, Leyte Philippines
Emily L. Casinillo Department of Mathematics, Visayas State University, Visca, Baybay City, Leyte Philippines
Lanndon A. Ocampo Department of Industrial Engineering, Center for Applied Mathematics and Operations Research, Cebu Technological University, Cebu City Philippines