Regular bananas sell for $0.49 per pund.Organic bananas sell for $0.85 per pound. If kate plans to purchase 2 1/2pounds how much more would the organic bananas cost
Regular bananas cost $0.49 per pound, so 2 1/2 pounds of regular bananas cost $0.49 x 2.5 = $<<0.49*2.5=1.225>>1.225.
Organic bananas cost $0.85 per pound, so 2 1/2 pounds of organic bananas cost $0.85 x 2.5 = $<<0.85*2.5=2.125>>2.125.
Therefore, the organic bananas would cost $2.125 - $1.225 = $<<2.125-1.225=0.90>>0.90 more. Answer: \boxed{0.90}.