[Sticks]

One batch assuming no losses due to mixture sticking on the pan makes 14oz of which butter is 50% of the total mass.

Convert to metric 14oz x 28.35 = 396.9g

As butter is 50% of the mass, that makes 198.45g of butter used.

Fat content of butter is given as 90g for every 100g of butter, that is therefore 90%

So in a total batch of 396.9g we have 195.45 x 0.9 = 178.605g of fat in a total batch

To scale down we need to calculate what percentage 100g is of the mass of a total batch

X = 100 / 396.9 = 0.252 or 25.2%

Therefore the fat content should be 178.605 x 0.252 = 45.0g of fat per 100g of oat biscuits