Why does fire burn? ?

Fire burns because it is a chemical reaction known as combustion. Combustion occurs when a fuel source combines with oxygen in the presence of heat, resulting in the release of energy in the form of heat and light. The fuel source, such as wood, paper, or gasoline, contains carbon and hydrogen atoms that react with oxygen from the air. This reaction produces carbon dioxide, water vapor, and releases energy in the form of heat and light. The heat generated sustains the combustion process, allowing the fire to continue burning as long as there is a sufficient supply of fuel, oxygen, and heat.

Assume XYZ Company acquired Equipment on September-1, 2004 at a cost of Birr 125,000 has
an estimated residual value of Birr 5,000 and an estimated useful life of 10 years. What should be; (a) the
depreciable cost, (b) the straight-line rate, (c) the annual straight-line depreciation and (d) the depreciation
schedule using straight line method?�