Converting/inserting values, without changing the other contents.

Hi all
this is what i require:
the overdue is INR 250k (SGD 7,543), out of which for INR 125k (SGD 3,771)
payment is processed, for INR 30k (SGD 905) bills resubmitted for queries,
for INR 25k (SGD 754) supporting were resubmitted, for INR 45k (SGD 1,358)
payment will be made in 1week of next month.
the above comments will be in m5 without the sgd value, i need help to
converrt those values and show as above in n5, after multiplying the
converting factor at b2

thank you