Ina certain code language, 'BLINK' is coded as '78' and '"PURSE' is coded as '54'. How will 'FIRST' be coded as in that language?

63

1   2    3    4   5    6   7     8    9  10  11  12  13

 A   B   C    D   E    F   G    H    I    J    K    L   M

 ↓    ↓    ↓    ↓    ↓     ↓   ↓    ↓     ↓   ↓    ↓    ↓    ↓

 Z   Y    X   W   V    U   T    S    R   Q   P    O   N

26  25  24  23  22  21  20  19  18  17  16  15  14

*********************************************

THE LOGIC FOLLOWED HERE IS :

CONSONANTS : REVERSE ALPHABETICAL VALUES ARE USED

VOWEL : ACTUAL ALPHABETS ARE USED

AS (NO CHANGE IN VOWEL)

B → (OPPOSITE) → Y → (PLACE VALUE) → 25

L → (OPPOSITE) → O → (PLACE VALUE) → 15

I → (NO CHANGE) → I → (PLACE VALUE) → 9

K → (OPPOSITE) → M → (PLACE VALUE) → 13

X → (OPPOSITE) → P → (PLACE VALUE) → 16

25 + 15 + 9 + 13  +  16 = 78

AND

P → (OPPOSITE) → K → (PLACE VALUE) → 11

U → (NO CHANGE) → U → (PLACE VALUE) → 21

R → (OPPOSITE) → I → (PLACE VALUE) → 9

S → (OPPOSITE) → H → (PLACE VALUE) → 8

E → (NO CHANGE) → E → (PLACE VALUE) → 5

11 + 21 +  9  + 8  + 5  = 54

SIMILARLY

F → (OPPOSITE) → K → (PLACE VALUE) → 21

I → (NO CHANGE) → I → (PLACE VALUE) → 9

R → (OPPOSITE) → I → (PLACE VALUE) → 9

S → (OPPOSITE) → H → (PLACE VALUE) → 8

T → (OPPOSITE) → M → (PLACE VALUE) → 7

21 + 9  + 9 + 8  + 7 = 54

HENCE   54   IS CORRECT ANSWER