CD = certificate of deposit (an investment) Interest rate, i = 10% per annum (simple interest) Principal, P = $2000 (present value) Period, T = 3 months = 0.25 year
Simple interest formula Interest earned = Pit =2000*0.10*0.25 =$50
Balance at maturity (amount that investor gets after three months) =$2000+$50 =$2050
X = gym memberships, and y = bottles of water 30x + 7y = 1050.....when x = 28 30(28) + 7y = 1050 840 + 7y = 1050 7y = 1050 - 840 7y = 210 y = 210/7 y = 30....so he would have to sell 30 water bottles