Final answer:
A bakery produces 112 nut bars out of 280 total granola bars. To increase this by 25%, they must produce 28 more nut bars.
Step-by-step explanation:
The subject of this question is Mathematics, specifically focusing on the concept of percentages and simple arithmetic.
Initially, the bakery produces 40% of 280 granola bars with nuts, which amounts to 112 nut bars (280 x 0.40 = 112). To find out how many more nut bars must be produced for a 25% increase, we calculate the new desired amount by multiplying the current number by 1.25 (112 x 1.25 = 140). Therefore, the bakery needs to increase by 28 nut bars to have a 25% increase (140 - 112 = 28).