"Je t'en donnerai une cinquantaine, si ça te dit."
Translation:I'll give you about fifty of them if you want.
I got this right because it was a listening exercise. But just for feedback: it was VERY difficult to hear the "te dit" part because the volume trailed off in both the fast and the slow versions. Secondly, I had never seen this idiomatic construction before so it was even more difficult to 'hear' what was said. Just saying