Answer:
End month 5 (5th month) is the answer
Seoul = 40-60% = 30% of 20 sweets = 6 = 12 + 40 = 52 + 12 = 64
12 + 64 = 76 + 12 = 88
12 + 88 = 100
Manila = 20 =80% = 40% of 20 sweets = 8 = 16 + 20 =36 + 16 = 52
16 + 52 = 68 + 16 = 84
84 + 16 = 100
Its actually end month 5
When i had calculated 3.
Explanation: