Kemps creates and modifies flavors of ice cream based on company research and consumer requests. Each container of Moose Tracks ice cream is 15% chocolate chunks. A lot of consumers have emailed the company complaining that the ice cream is not Moose Tracky (chunky) enough. To save on production costs, they decide to modify existing batches of the original ice cream batter. The ice cream batter is made in 400-pound batches. How many pounds of pure chocolate (chunks) would have to be added to the original ice cream batter to raise the amount of chocolate chunks in the ice cream to 25%?