preparing unbuffered and buffered solutions of 20mM sucrose

In the lab is the follwoing stock solutions:
0.1 M (100.0 mM) sucrose
0.2 M(200.0 mM) acetic acid
0.2 M(200.0 mM) sodum acetate
0.2 M (200.0mM) anhydrous sodium carbonate
0.2 M (200.0mM) sodium bicarbonate

The acetate buffer consists of acetic acid and acetate ions. A chemistry reference indicates that a solution containing 40mM acetic acid and 60mM sodium acetate will produce an acetate buffer with a pH of 4.8. Calculate the amount of of each stock solution and the amount of dH2O needed to prepare 100 mL of an acetate buffer that contains 20 mM sucrose, 40mM acetic acid, and 60mM sodium acetate. formula is c1v1=c2v2

  amount of 0.1 or 100 mM sucrose needed is 20?
amount of 0.2 M or 200mM acetic acid is 80?
amount of 0.2 or 200 mM sodium acetate needed is 120?
amount of dH2O needed ? all of the above 20 + 80 + 120 + 220 so how an I to figure out how much distilled water to add 
thanks if you can help