A project has a cost estimate of $50 per week and is scheduled for completion in 10 weeks. The actual cost and earned value data are collected for the first 7 weeks. The actual costs are 50, 50, 60, 60, 50, 40, and 50. The earned values are: 50, 50, 55, 65, 45, 35, and 40. Please do the following: (a) evaluate its cost and schedule variances at the end of week 7, (b) calculate its cost, schedule and project performance indices at the end of week 7, (c) predict how much it will cost in total to finish the project (using EACf), and (d) plot the earned value chart. The EACf is