A hotel purchases an air-conditioning system for OMR 100,000 and with an installation cost of OMR15,000 on 1st October 2017. The useful life of the air-conditioning system is for 10 years and with the residual value of OMR 20,000 . Assume that the company use straight line method for calculating depreciation, Calculate the following: a. Rate of depreciation b. Depreciation amount and Book value of the machinery for year 1 , year 2, year 3