Assignment 1 1. A company is going to purchase a production equipment with the purchase price of 167000 yuan and the service life of 10 years. It is estimated that the equipment can increase the income of the enterprise by 42000 yuan per year. Assuming the annual interest rate is 10%, is this equipment worth purchasing? 2. An enterprise needs an equipment, the purchase price is 10000 yuan, and it can be used for 5 years. If it is rented, the rent will be 2000 yuan at the beginning of each year. Other than that, buying is the same as renting. Requirement: with interest rate of 6%, the data with calculation process should be used to explain which is better to buy or rent. 3. An enterprise has an investment project. It borrows 3 million yuan from the bank. It is agreed to pay off the loan in 8 years. The interest is 6% every year. The construction period is 3 years. It is estimated that the stable income can be obtained every year after it is put into operation. If the annual discount rate is 8%, how much of the annual income must be achieved to repay the bank loan