renew or not to renew

Hello.
I see now that there is a button where it gives me the oportunity to renew.
The info I have is this:
Expires on: 4th July 2014
Invoice: SI130627-5747-95170

Now my question is the following:
1. Will it add the remaining time to the new upgrade of 1 year?
this would mean: 4th of july + 4 months = 4th of october 2015.
Is this correct to asume this, this way?

2. The total amount I paid was: 89,54 USD (includes 21% spanish VAT)
Now... if I renow NOW the price will be : 71,53 EURO which makes it in dollars: 98.24 USD
How come the renewal price is higher than the original price I paid?
I tought having read somewhere, like for instance here: http://stackideas.com/forums/renewal-vs-new#reply-126073
that when subscriptin finished you send out specific coupons so I can get a 20% discount. If this is true, would my price be than:
98,24 USD - 20% = 78,60 USD = 57.21 EURO (with the 21% spanish VAT incl.)

If this is correct, is it possible to obtain my code so I can renew my subscription and have it running up-until 4th of october 2015?

Pleas let me know IF I have understood this correctly and IF it si possible.
Hoping to hear from you again.
Regards,
Paco