Variable assignment

In prior versions of Mathcad, I could create variables such as 'products' shown above. I could then create a variable like rate and assign a value of 100 products/min. Subsequent calculations would then allow me to change the units using the 'product' variable. Per the example above, I need the result of the last operation to be '300 products/min'. Is there a way to do this? It worked perfectly in Mcad 15 fwiw.
Thanks


