>Supply chain resource planning (operations management)Question 1 Over the past eight months sales of are as follows: Estimate sales for month 9 using last period forecasting. Then calculate the mean error mean absolute deviation and mean squared error for this forecasting method. Lastly name another forecasting method that would provide the exact same results. Question 2 Mafina company has two distinct selling seasons during a year: peak (spring-summer) and off-peak (fall-winter). Based on the sales data from the last three years forecast peak sales for year 4 using an exponentially weighted moving average with a smoothing constant of .3 and an initial forecast of 105. Question3 During negotiations with a supplier for yangk two contract options have been proposed for the upcoming year. Option 1: a payment of $13000 is due at the end of each quarter (every three months) and after the final payment of the year is made a rebate is received from the supplier one month later for $9000. Option 2: a payment of $12000 is due at the end of each quarter but no rebate is given. Based on an interest rate of 2% per month what is the present value of each contract option and which one should the er select?