Mary thinks that BPs Espresso machine is about to stop working and she has been looking for a suitable replacement. She has identified four potential models and has decided to assess their initial suitability using a multi-criteria analysis (MCA). Mary has identified three key criteria, Cost, Reliability and Speed and assigned weightings of 0.5, 0.3 and 0.2, respectively to these. She then asked several expert baristas for their views on the four chosen models and, based on this, rated each of the four potential suppliers using a four-point rating (with 4 the best and 1 the worst). The decision matrix below summarises this information:

Model	Cost	Reliability	Speed
San Remo	2	1	3
La Spaziale	4	2	1
Expobar	3	3	2
Astoria	1	4	4

1. Which model is preferred based on the information provided? Show your workings.