$($a$)$ What is centralization; with examples discuss advantages and disadvantages of centralized system. b$)$ The information for two mutually exclusive projects are given belowProject AInitial Investment$20,000,000$Project BDuration of project$30,000,0005$ years$5$ yearsThe profits before depreciation and after taxation $($cash flows$)$ are as follows:Year $1$Year $2$Year $3$Project A Project B$5,000,00010,000,000$Year $4$Year $510,000,0003,000,00020,000,00010,000,0002,000,0005,000,0003,000,0002,000\mathrm{.}000$From the above information, calculate the net present value of the two projects and comment what of the two projects should be accepted if a discount rate of the two projects is $10\%?$