15 identical solid spherical balls of radius 5 cm are melted to form a single sphere. In this process, 35% of the mass is wasted. What is the radius (in cm) of the single sphere that is now formed? [Use $$\pi = \frac{22}{7}$$, and give your answer correct to two decimal places.]

A

12.68 cm

B

16.68 cm

C

10.68 cm

D

34.68 cm