Actually, both the Answers available in Link contain part-b also.
LALR Parser is type of Bottom up Parser which uses Right most Derivation
By this info. I think we may get result as 7 also.
(We know grammar is ambiguous here so same precedency )
But due to YACC tool(prefer shift over reduce) given as part of linked question here even if 3∗2 (E∗E) handle found on top of the stack at some point of time, it will shift on reading + instead of reducing with E→E∗E.
But as per ur given quotation it may compute 3*2 also.
Plz see Debashis's ans in given link there he have put the o/p with black screen.