iPhone X iPhone 8 Plus 999 $ 799 iPhone 8 699 iPhone 7 649 $ $ 581 248 248 288 5 5 2 Sales price (base models) Estimated direct materials (from IHS Markit and 3 Susquehanna International Group) 4 Estimated direct labor (assembly and testing) Estimated retail packaging and shipping to 5 warehouses/stores) 6 Total variable costs 7 Contribution margin per phone 8 Minutes of skilled labor required for assembly 5 594 L 405 $ 297 502 S 2 57 4 42 $ 257 392 he Excel file containing the iPhone data and assumptions can be downloaded nere, Questions 1. Which iPhone model is the most profitable for Apple? Which metric are you using to gauge profitability? Defend your choice of metric