Let us find the encripted formula that satisfies the three countries.
After several trials , I came up witjh:
(A + B + C + D + E) x 12 where A, B,C,D,E denote the position in the alphabet
GHANA ( 7 + 8 +1 + 14 + 1) x 12 = 372
CHILE ( 3 + 8 + 9 + 12 + 5) x 12 = 444
NEPAL (14 + 5 + 16 + 1 + 12) x 12 = 576
Then,
CHINA ( 3 + 8 + 9 + 14 + 1) x 12 = 420
The answer is 420