Hi, i am having trouble solving this problem and a few similar ones for school, i missed a few lessons due to a holiday and help getting on the correct path. 
APA Manufacturing is considering investing in a processing machine at a cost of £57,500. The annual savings predicted, compared with the old packing method, are as follows:
 
After 4 years the machine will be disposed of.
The discount rate APA uses for investments such as this is 8% p.a., compounded annually.
1) Work out the NPV of this investment.
2) Should APA Manufacturing proceed with the purchase?
				
			APA Manufacturing is considering investing in a processing machine at a cost of £57,500. The annual savings predicted, compared with the old packing method, are as follows:
| Year 1 | Year 2 | Year 3 | Year 4 | 
| £10,000 | £12,000 | £20,000 | £20,000 | 
After 4 years the machine will be disposed of.
The discount rate APA uses for investments such as this is 8% p.a., compounded annually.
1) Work out the NPV of this investment.
2) Should APA Manufacturing proceed with the purchase?
 
				