Acu-ni alloy is heated to 1200°c. at this temperature the alloy is 30 wt% liquid and 70wt% solid. chemical analysis of the liquid indicates that it is 20 wt% ni and chemical analysis of the solid indicates that it is 30 wt% ni. what is the overall composition of the alloy? (a) 21 wt% ni (b) 23 wt% ni (c) 25 wt% ni. (d) 27 wt% ni.*