In a certain code language, 'LOWER' is coded as '186' and 'MULISH' is coded as '320'. How will 'OPTIONAL' be coded in that language?

456

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;

(sum of the positional values of opposite letters x total no. of consonant in word)

So,

LOWER --> OLDVI (opposite letters)

L,W,R = 3 consonant 

15+12+4+22+9

62

then, 62x3= 186

And,

MULISH--> NFORHS

M,L,S,H = 4 consonant

14+6+15+18+8+19

80

80x4= 320

Similarly,

OPTIONAL --> LKGRLMZO

P,T,N,L = 4 consonant

12+11+7+18+12+13+26+15

114

114x4= 456.