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): "0.81" was replaced by "(81/100)".

Step  1  :

             81
 Simplify   ———
            100

Equation at the end of step  1  :

                81
  ((d2) • f) • ———
               100

Step  2  :

Final result :

  81d2f
  —————
   100