Hello, I´m translating a text on relations between Cuba and Venezuela and I have come across a structure that I´m not exactly sure I understand. The whole sentence reads: El 80% de la balanza comercial entre ambos países corresponde a las adquisiciones de bienes y servicios que realiza Cuba a Venezuela. As I understand it, Cuba purchases goods and services from Venezuela, but I´m a bit confused with the preposition "a" - I would use "de". Could anybody help me with this? Thanks very much!