Unit place: 04 , 14 , 24 , 34 , 44 , 54 , 64 , 74 , 84 , 94(Total = 10)
replaced by: 05 , 15 , 25 , 35 , 45 , 55 , 65 , 75 , 85 , 95 (Each increase by one so 10*1 = 10)
and
tense place: 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49(Total = 10)
replace by : 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ( Each increase by 10th so 10*10 = 100)
So total =10 + 100 = 110
final answer is 5050 + 110 = 5160