Express here means write/ say/ put all money in pesos (instead of US$ or UKú)
through P100 means in all of p. 100. Through or throughout
What are given as data (data and information is noncountable and therefore the implied word after what is either data OR information and so this should read what IS given.)
What is/are the operation/s to be used? is awkward but commonly used. Is/are to be bascially means must: English is to be used in the forum - English must be used in the forum.
As for ducks ... I don't know! BUT poultry is noncountable and so the poultry IS being raised.
Never be frightened to ask questions whether one is confused or not!