Hypothesis Tesing(one case)

An advertising agency was hired to introduce a new psychopharmacological product. It claimed that after its campaign, 40% of all consumers were familiar with the product. To check the claim, the manufacturer of the product surveyed 2,000 consumers. Of this number, 750 consumers had learned about the product through the sources attributable to the campaign. What is the probability that as few as 750 (i.e., 750 or less) would have learned about the product if the campaign was really 40% effective?

Would anyone help? :'(
thanks!