Normal and inverted exclamation and question mark pairs Challenge

¡We're going to give exclamation and question marks inverted buddies!

Given a body of text containing sentences ending in ., ?, or !, prepend inverted question marks, ¿, to interrogative sentences (sentences ending in ?) and inverted exclamation marks, ¡, to exclamatory (sentences ending in !). Sentences ending in . are to be ignored.

Sentences will be separated by whitespace (spaces, tabs, and/or newlines) and will only contain alphanumerics, commas, apostrophes, and spaces. Every sentence will have at least one word. The first word of every sentence is guaranteed to be capitalized. Input can start and end with any whitespace.

Example

Input:

  Hello there!      What is your name?
My name is Ron. What's your name?
My name is Alex.  Nice to meet you!
Nice to meet you to!  How was your break?
It was great, I spent all my time code golfing!
What's that?
        Wow, you're such a n00b! Here, let me show you.


Output:

  ¡Hello there!      ¿What is your name?
My name is Ron. ¿What's your name?
My name is Alex.  ¡Nice to meet you!
¡Nice to meet you to!  ¿How was your break?
¡It was great, I spent all my time code golfing!
¿What's that?
        ¡Wow, you're such a n00b! Here, let me show you.


Rules


All default Code Golf rules apply.
The program with the shortest amount of bytes wins.


Bonus (17% off) - Parse multiple marks

A sentence can also end in multiple exclamation/question marks. Give each of these marks a paired inverse exclamation/question mark for an extra 17% off your byte count.

Example

Input:

I am a man in a can doing a dance?? Maybe...
              Doing it for the views??!???!


Output:

¿¿I am a man in a can doing a dance?? Maybe...
              ¡¿¿¿¡¿¿Doing it for the views??!???!


Incorrect output:

¿¿I am a man in a can doing a dance?? Maybe...
              ¿¿¡¿¿¿¡Doing it for the views??!???!
Retina, 39 37 34 bytes

\w[^.]*?([!?])
$1$0
T`?!`¿¡`\S\b


Try it online.

Explanation

\w[^.]*?([!?])
$1$0


This matches a sentence ending in an exclamation or question mark, and prepends that punctuation character to the sentence. Now we know that all the ! or ? which are immediately followed by a non-space character must be those we inserted, because the original ones should be separated from the next character by a space.

T`!?`¡¿`\S\b


This transliteration stage turns all ! and ? into ¡ and ¿, respectively, provided they're found in a match of \S\b, which applies only to the ones we just inserted. Replacing both in two separate substitutions in the same byte count, but I prefer the semantics of a transliteration stage here.