please include the formula for how you came to your answers.

Mountain Mole Foods has decided to use the perfect order measurement approach to track its logistics performance. According to Mountain Mole, a perfect order is one that (1) is delivered on time, (2) arrives in one complete shipment, (3) arrives undamaged, (4) is correctly billed. Mountain Mole has the following performance figures for the past four years: (Assume that there is at most one error per order.) Year 2017 2018 2019 2020 Total Shipments On-time Shipments Complete Shipments Undamaged Shipments Correctly Billed Shipments 275,000 325,000 360,000 380,000 225,000 295,000 340,000 350,000 230,000 280,000 335,000 355,000 232,000 275,000 328,000 372,000 210,000 255,000 275,000 295,000 a) Calculate performance for each of the four years. What is the overall trend in the performance, if any? What factors explain the results? (5 points) b) If you were looking to improve Mountain Mole's logistics performance, what areas might you concentrate on based on these results? (1 point)