Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "d2"   was replaced by   "d^2". 

(2): "0.16" was replaced by "(16/100)".

Step  1  :

             4
 Simplify   ——
            25

Equation at the end of step  1  :

                4
  ((d2) • f) • ——
               25

Step  2  :

Final result :

  4d2f
  ————
   25