Here are the answers to the questions: 13. Highlight four adverse effects of production activities on the environment and community. Environmental pollution*: Release of harmful substances into the air, water, and soil. Resource depletion*: Over-extraction of natural resources like minerals, forests, and water. Habitat destruction*: Clearing land for factories and infrastructure leads to loss of biodiversity. Community health issues*: Exposure to pollutants can cause respiratory diseases, cancers, and other health problems for nearby residents. 14. State four factors that influence the level of national income in a country. Availability of natural resources*: Abundance of land, minerals, and energy sources. Capital formation*: Investment in machinery, infrastructure, and technology. Human capital*: The quality and quantity of skilled labor and entrepreneurship. Technological advancement*: Innovation and adoption of new production methods. 15. State four ways of determining prices for commodities. Market forces (supply and demand)*: Prices are set at the equilibrium point where quantity supplied equals quantity demanded. Cost-plus pricing*: Adding a markup percentage to the total cost of production. Government regulation*: Imposing price ceilings or floors on certain essential commodities. Competition-based pricing*: Setting prices based on what competitors are charging for similar products. 16. List four types of source documents. Invoices*: Documents requesting payment for goods or services provided. Receipts*: Proof of payment for a transaction. Purchase orders*: Documents issued by a buyer to a seller, indicating types, quantities, and agreed prices for products or services. Bank statements*: Records of all transactions in a bank account over a period. 17. State four principles of a good tax system. Equity (Fairness)*: Taxes should be levied according to the ability to pay, ensuring a fair distribution of the tax burden. Certainty*: Taxpayers should know exactly what, when, and how much tax they are required to pay. Convenience*: The method and timing of tax payment should be easy and convenient for the taxpayer. Economy (Efficiency)*: The cost of collecting taxes should be minimal compared to the revenue generated. 18. Mention four problems faced when computing price indices (CPI). Quality changes*: It is difficult to account for improvements or deteriorations in the quality of goods over time. New goods and services*: The basket of goods needs frequent updating to include new products, which is a complex process. Substitution bias*: Consumers tend to substitute away from goods whose prices have risen, but the fixed basket of goods in CPI doesn't immediately reflect this. Sampling errors*: Data collection relies on samples of prices and outlets, which may not perfectly represent the entire market. Send me the next one 📸