Answer:
£57.6
Step-by-step explanation:
Given :The pen must have a perimeter of 24 m
Every half meter of fencing costs him £1.20
To Find : Work out the cost of the fence used to make the sheep pen.
Solution :
Cost of fencing 0.5 m = £1.20
Cost of fencing 1 m = 
The pen must have a perimeter of 24 m
So, cost of fencing 24 m = 
Hence the cost of the fence used to make the sheep pen is £57.6