Some question is solved on the basis of certain system. On the same basis find out the correct answer from amongst.
a =12 (390) 8,  b=7(134) 5, c=5(?) 12

Directions: Answer these questions referring to the symbol-letter-number sequence given below:
7 2 A*3 K S Ϩ 5 M W $ 1 ß H ƴ 8 Z @ ∆ J F 9 P # £ X 4 C V 6 ? R

What is the total number of ‘the numbers immediately followed by a letter’ and ‘the symbols immediately preceding the letters’ together in the above sequence?