Bheja fry question

 Recently I came across this question

SOFT      =     6153

FOOT      =     4112

ZONE      =     ???

Answer 

When I read this question, I figured out that  o is  1.

But T changed it value from  3 to 2.

Rest alphabets I could not think of any logic. 

I didn't wasted time searching for answer.

I had a look at the given answer. 

It is like this...... 

 

We will write the value of number in words and assign the first letter of the word from 0 onwards......  

First letter of word zero = z = 0

 First letter of word one = o = 1

First letter of  words two and three  = t = 2 and 3

First letter of word four and five = f = 4 and 5

First letter of word six and seven = s = 6 and 7

First letter of  word eight = e = 8

First letter of word nine  = n = 9

According to the above chart, 

ZONE  =  0198  !!!