good explanations, formula, graphs , definitions used etc

Q2. Consider the following two series: 50 50 -300 200 200 200 Which series has the larger present discounted value if the interest rate is... i. ...0% per year? ii. ...5% per year? iii. ...15% per year? iv. ...1000% per year? Q8. Consider the following statements about the income-compensated demand curve (CDC) and the uncompensated demand curve (UDC): i . When economists talk about 'standard' demand curves without specifying whether they are making reference to CDCs or UDCs, they are typically referring to CDCs. ii. For a normal good, the CDC is steeper than the UDC. iii. The magnitude of the difference in slope between the CDC and UDC depends on the magnitude of the substitution effect. iv . The magnitude of the difference in slope between the CDC and UDC depends on the magnitude of the income effect