Crack the logic if u r smart enough 1 1 1 1 =R

CRACK THE LOGIC IF U R SMART ENOUGH
Ouestion of IIT-B

If 1 1 1 1= R
    2 2 2 2= T
    3 3 3 3= E
    4 4 4 4= N
Then 5 5 5 5= ?

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1 1 1 1= R (Since 1+1+1+1=4-FOUR=R(Last Letter))
Similarly 2 2 2 2=8(Eight) Hence T
Then 5 5 5 5= Y Since 5+5+5+5=20(Twenty) and hence answer is Y