Sheridan Limited purchased four articulated robots on account on May 1,2024, at an invoice price of $536,000. On May 2, it paid $4,000 for delivery of the robots, A one-year, $5,500 insurance policy on the robots was purchased on May 3, On May 30, Sheridan paid $10,000 for assembly, installation and testing of each robot on a production line. The robots started operating or were ready for use on July 1. Sheridan estimates the useful life of the robots will be four years or 9,600 units with a residual value of $100,000. Assume the robots collectively produce the following numbers of units each year: 1,500 units in 2024:2,500 units in 2025;2,300 units in 2026:2.300 units in 2027; and 1,000 units in 2028 . Sheridan has a December 31 year end. * Your answer is incorrect. Determine the total cost of the robots. Cost of the robots $ Calculate the annual depreciation and total depreciation over the robots' lives using the: (Round the depreciation cost per unit to 2 decimal places, e. 25.50 and final answers to 0 decimal places, eg. 5,275.) (1) Straight-line method (2) Double-diminishing-balance method (3) Units-of-production method Which method causes net income to be lower in the early years of the robots' lives