Select the number-cluster that is related to the third letter-cluster in the same way the first letter-cluster and fifth letter-cluster are related to the second number-cluster and sixth number-cluster. PERFECT : 60 :: TRANSPORT : ? :: NUCLEAR : 18

The logic followed here is: The product of the place values of the last two letters from the left end as per the English alphabetical series of the given word is the number-cluster. In ‘PERFECT’: The place values of the last two letters (C and T) are '3' and '20'. 3 × 20 = 60. So, ‘PERFECT’ is related to '60'. In ‘NUCLEAR’: The place values of the last two letters are '1' and '18'. 1 × 18 = 18. So, ‘NUCLEAR’ is related to '18’. Similarly, in ‘TRANSPORT’: The place values of the last two letters (R and T) are '18' and '20'. 18 × 20 = 360. So, ‘TRANSPORT’ is related to '360'.