Answer:
Cincuenta <u>por</u> ciento
Para wouldn't make sense, and I heard of the phrase and it is por.
Hope this helps
Answer by
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Which word correctly completes this sentence? Estas camisetas son grandes, pero _________ son pequeñas.
Answer : Estas camisetas son grandes, pero aquellas son pequeñas.
Explanation : The subject in this sentence is "camisetas", that is a plural feminine noun, so the pronoun than replaces it must agree. Aquellas.

Answer:
1. ¿Cuál es la llave?
2. ¿Qué música les gusta a ustedes?
3. ¿Cuál es el estado civil de <em>Britney Spears</em>?
4. ¿Qué es eso?
Explanation:
In this exercise you have to elaborate questions according to the statements you have.
1. Your boss aks you to open the door but you have many keys. So in this case you have to ask <em>what's the key?.</em>
2. You organize a party and you want to know the kind of music your friends like so you have to ask them <em>what kind of music do you like/prefer?</em>
3. You need to know the marital status of a celebrity. To do that, you have to ask somebody who knows/likes the celebrity the following question: <em>What's the marital status of (the name of the celebrity)?</em>
4. You are looking at the sky and you see something strange so you have to ask <em>what is that?</em>
Muslims created the al-andalus