Please show steps please round to 2 decimal places
We can also use the concept of "useful life" to determine the effectiveness (or projected value) of programs (like charitable fundraising) just like we do with machines. Suppose, f for example, That t weeks from now, contributions to a specific fundraising campaign will f be coming in at the rate of r'(t) = 5000e-0.2t dollars per week, while the expenses for the campaign will accumulate at the constant rate of $676 per week. What is the useful life of this campaign? How much will the net earnings be on this campaign?
