Government has two (2) plans to deal with their water supply problem. Option 1 is to...

Question:

Government has two (2) plans to deal with their water supply problem. Option 1 is to build a complete water pumping plant costing P 2 Billion, which would meet all needs during the 1st 30 years. Annual maintenance costs are estimated to be at P 2 Million for the 1st 15 years and P 3 Million for the succeeding 15 years. Option 2 is to build a partial water pumping plant at a cost of P 1.25 Billion, which would be sufficient for the 1st 15 years. At the end of 15 years, the pumping plant will be completed at an estimated cost of P 1.5 Billion. Annual maintenance cost is P 1.5 Million during the 1st 15 years and P3 Million for the succeeding 15 years. At 8% interest, which plan would you recommend?

What is the derivative of ln((e^x)/(1+e^x))?
What is the derivative of ln((e^x)/(1+e^x))?...