Final answer:
Out of the 298 U.S. Army Rangers who landed at Point du Hoc during the D-Day invasion in World War II, approximately 90 of them successfully scaled the 100ft cliff to knock out the six 155mm Howitzers.
Step-by-step explanation:
In the context of the question, the 298 Rangers mentioned are most likely referring to the U.S. Army Rangers who participated in the D-Day invasion during World War II. Point du Hoc was a key objective for the Rangers on D-Day, and their mission was to scale the 100ft cliffs to neutralize the German artillery batteries positioned there. Out of the 298 Rangers who landed at Point du Hoc, about 90 of them successfully made it up the cliffs to destroy the six 155mm Howitzers.