Convert values at level {3} in a list to percentages

Question

I have the list

m = {{x == 0, y == 0.29264681456942615}, {x == 30 , y == 0.2419119568894183},
     {x == 50 , y == 0.1485164898707659}, {x == 70 , y == 0.05437093382683481},
     {x == 90 , y == 1.`}} 

and I want to change the unit into percent only for y value. So the output that I want will be

m = {{x == 0, y == 29.264681456942615%}, {x == 30 , y == 24.19119568894183%},
     {x == 50 , y == 14.85164898707659%}, {x == 70 , y == 5.437093382683481},
     {x == 90 , y == 100%}} 

How can I do this??

Answer 1

StringForm[] works nicely for this:

m /. y == n_?NumericQ :> y == StringForm["`1`%", InputForm[100 n]]
   {{x == 0, y == 29.264681456942615%}, {x == 30, y == 24.19119568894183%},
    {x == 50, y == 14.85164898707659%}, {x == 70, y == 5.437093382683481%},
    {x == 90, y == 100.%}}

Answer 2

 m /. y == y1_ :> y == ToString[100 y1] <> "%"

or

m /. y == x_ :> y == Row[{100 x, "%"}]

or

m /. y == x_ :>  y == AccountingForm[100 x, 6, NumberPadding -> {"", "%"}]

all give

{{x == 0, y == "29.2647%"}, {x == 30, y == "24.1912%"}, 
  {x == 50,y == "14.8516%"}, {x == 70, y == "5.43709%"}, {x == 90,  y == "100.%"}}