Barbie's 50th anniversary

This day’s question: When Barbie first went on sale in 1959, around 350,000 were sold in the first year. How many dolls sell today?

b) 3 per second

I am charmed with this topic, I continue liking the barbie and I believe that she is the model to continuing of many girls.
The vocabulary of the audio helped me very much since I did not know the meaning of any words, but even like that it did not turn out to me difficult to understand it.