Charming Plc decision tree

i think for machine B - if high demand .6*4000*10 + the low demand .4*1000*10 and deducting the cost 15000 that's 13000$ and for A- when high demand .6*2000*10 + choosing to invest instead to scrap to get 2500 + 5000*.4 so total of 15000 and then deduct 10000 so we choose B - i'm not completely sure, will be good if mr.john approves it or not

Ayman is completely correct :-)