Sarabanda is a retailer that created his business on 1 January X1. When created the WCN was 800 CU. The fixed depreciable assets (only fixed assets) cost 500 CU to acquire. They have a useful life of 5 years and no residual value. Sarabanda chose the use straight-line depreciation for these assets. Unfortunately for Sarabanda, the store was not as successful as forecasted. Sales revenue was 1,000 CU in the first year, and declined by 50 CU each consecutive year until period 4 included. COGS, throughout the first 4 years, stands at 50% of sales revenue. SG&A expenses stand at 10% of sales revenue. WCN for each of the years stands at (75% of sales revenue):

The actual cost of financing the WCN is 5% of the WCN. The sequence of return on average net assets (excluding cash) for each of the four years of operations under scrutiny is: (Difficulty: Difficult)