I am not sure if an article is required before percentages in Spanish. Are both examples below correct?
- Él redujo la pobreza de 60% a 36 %.
- Él redujo la pobreza del 60% al 36%.
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Let's see. According to the Spanish Gramática:
Las expresiones fraccionarias que designan porcentajes (treinta por ciento, ochenta por ciento) son nominales.
This is, the group "X por ciento" acts as a whole as if it were a noun. Hence they must comply with the standard rules for nouns:
Un treinta por ciento de los trabajadores se sumaron a la huelga.
El setenta por ciento restante acudió al trabajo con normalidad.
If you want to omit the article you need to stick to the standard rules for omitting the article before nouns, but how do you generalize the concept of "X por ciento"? Usually a percentage is an amount of something ("30 por ciento de algo"). Generalizing the concept of "30 por ciento" would imply referring to that percentage for any thing that can be expressed as a percentage, or maybe it would imply to talk about the percentage itself and not about the percentage of something.
Given that this is not the case, you definitely need the article in your example, as you are talking about a specific percentage of a specific property (poverty). So the proper sentence is the second one:
Él redujo la pobreza del 60% al 36%.
Both forms are fine but they have different implications.
I agree with Charlie about the article based on the fact that a percentage is a part of a whole
Él redujo la pobreza de [el] 60% a [el] 36% [de los habitantes del país]
Buth the prepositions de and a also denote origin and destiny. In other words, these prepositions are equivalent to desde and hasta. So:
Él redujo la pobreza de 60% a 36% (desde 60% hasta 36%)
I admit this may be arguable because as a percentage is a part of a whole, this form also warrants an article:
Él redujo la pobreza desde el 60% al 36%
But the preposition de is also a quantifier:
Íbamos a una velocidad de 150km/h
Thus, with quantities we can say:
El coche nuevo puede acelerar de 0km/h a 100km/h en dos segundos
We may now think this is a different case; however we may be tempted to say
El coche nuevo puede acelerar desde los 0km/h hasta los 100km/h