FMProbability and scrap value

Machine 1 will initially cost $480,000, have a life of four years,scrap value of $60,000 and annual running costs if $72,000. Machine 2 will initially cost $540,000, have a life of four years,scrap value of $120,000 and annual running costs if $47,000 It is now felt that final scrap value of machines depends on 2 factors, whether or not a new supplier enters the market (which would reduce the likely scrap value) and the strength of the dollar against other currencies( since sales of used machines will be made abroad and invoiced in foreign currency) . Adverse effects each will reduce the scrap value by 10% of the fig used in investment appraisal. Relevant probabilities are as follows New supplier Probability Strong $ proba Yes 0.4 yes 0.3 No 0.6 no 0.7 What is now expected value of scrap proceeds from machine 2? a)$106800 b)$109000 C)$111600 d)$113000 Correct ans is C Sir please can you explain