Your uncle is trying to figure out how much he has to have set aside today to pay for his son's undergraduate education. The first payment is due tomorrow. Tuition is $15,000 per year for the next four years, with payment due always at the beginning of each academic year. a, what's the EAIR if a 6% rate compounded semi-annually? % (2 decimals) b, what's the present value of annuity excluding the first payment?$ (2 decimals) c, how much should your uncle have set aside today in order to pay for four years of tuition assuming he can invest his money at a 6% rate compounded semi-annually?$