Hi, can you help me with these questions? and also can you explain to me how you the answer because I'm not to understand with that question.

1 . TABLE Q1 shows the demand schedule for a product called Good SRC. TABLE Q1 Price Quantity Demanded for (USD) Good SRC 8.00 400 7.00 500 6.00 600 5.00 700 4.00 800 a. Solve and determine price elasticity of demand when the price increases from USD4.00 to USD5.00. b. Solve and determine price elasticity of demand when the price decreases from USD8.00 to USD7.00.2. If price increases by 10% and demand for CDs fell by 20%. what is the price elasticity of demand for CDs'? 3. Calculate the price elasticity of demand, if the price of petrol increased from $ 130 to $ 140 and demand fell from 10,000 units to 9,900 units. 4. Based on the following diagram, calculate the total revenue and the price elasticity of demand if the OPEC (Organization of Petroleum Exporting Countries) try to increase the price of oil. 82 $30 $15