There were two solid spherical balls. Ratio between radius of first ball to that of second ball is 4 : 3. Second ball was cut into two equal halves and the difference between total surface area of first ball and total surface area of a part of second ball is 1424.5 cm 2;. Find value of radius of bigger ball ?

• A. 14 cm
• B. 16 cm
• C. 10.5 cm
• D. 20 cm