anyone please show me how to work on this problem

The EUAC of the challenger at its minimum cost life of 5 years is $8,700. The marginal costs of the defender igprovided in the table below. Year Marginal Cost in 5 7,500 8 000 8,500 9,000 9,500 a. Which replacement analysis technique would you use? 'Why? I 1:. Determine when the defender should be replaced