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Citizens of Hong Kong who believe they are at a higher risk of COVID-19 exposure can get a Deep Throat Saliva (DTS) sample collection kit from any of the approved distribution stations and return the sample to one of the designated collection points. The Hospital Authority (HA) has chosen a few basic outpatient clinics to make test kits and sample submission easier for the general population. On Hong Kong Island, there are four designated GOPCs (M1 to M4).

DTS samples are collected daily from each of Hong Kong Island's four GOPCs and sent to a commercial testing laboratory for analysis by light goods vehicles. The following table shows the freight charges, number of specimens to be transported, and GOPC latitude and longitude.

Question:

1(a) Use center of gravity method to determine the least-cost location (Latitude and Longitude) of a commercial testing laboratory which serves the four GOPCs. Show the units and steps of calculation. Round the answers to 2 decimal places.

1(b) The Department of Health has accredited several commercial testing laboratories on Hong Kong Island to provide testing services. Explain THREE considerations that the HA should consider when selecting an accredited testing laboratory based on the location solution obtained by the "center of gravity" technique from the perspective of a logistics manager.

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