**Correct Option:- (B) 5s + 80n**

**Explanation :-**

Let numbers be a_{1} , a_{2} , a_{3} , a_{4} ......,a_{n}

S = a_{1} + a_{2} + ..... + a _{n }

If each number is increased by 20, multiplies by 5 & then decresed by 20 then

a' i = (ai + 20)5 – 20 = 5a'_{i } + 80

i = 1, 2, 3,.....,n

so S' = a' 1 + a'2 + a'3 + ......+a'_{n}

= 5(a_{1 } + a_{2} + a_{3 } +.....+ a_{n} ) + n.80 = 5S + 80 n