How the sequence of expression should be in a single ruleset in RPAS

We have a query in this below expression

A = if(UnelapsedB, B*C, ignore)

B = A/C

B - has No Database,No load rule, No commit rule (recalc - Default agg)

A - has Database,load rule,commit rule (total - Default agg)

C - has Database,load rule,commit rule (total - Default agg)

Data loaded in Back-End:

A - 10

B -  2

C -  5

In the Front-End we are getting the below values:

Elapsed period                          

A - 10                                  

B -  2

C -  5

Unelapsed Period

A - 0

B - 0

C - 5 

For elapsed period, As "B" does not have the database when I re-open the workbook "A" will be Zero.