Suppose Y f X if Y 80 100X then what will be dY dX according to-09402

Suppose Y = f(X), if Y = 80 100X then what will be dY/dX according to rules of differentiation?

This multiple choice question (MCQ) is related to the book/course vu eco404 Managerial Economics. It can also be found in vu eco404 Final Term - Quiz No.4.