I need some help in excel. I m modelling for a mobile app company and projecting financials for the next 60 months. There are downloads and active users as a % of downloads. The app is used across different categories and each category has a different % of active users associated with. The % of active users follows a bell curve as engagement leves increase and then again dip. Now the client says the bell curve % has to be applied to each addition and not total downloads. Any idea how this can be modelled without macros. There are 15 cities and 20 categories, so modelling for each monthly addition with a different bell curve becomes cumbersome. Appreciate any help in resolving this and this pretty urgent. Thank in advance.

Prashanth