Finance questions

Iam have difficulties on answering the questions below. I am looking for calculations and explanations for them. I want a tutor so I can learn from.

Q2. A call option is the opportunity to sell a stock at a given price within a defined time frame.

   a. true   b. false

Q5. In making decisions using benefit-cost analysis, analysts often find themselves struggling to deal with trade-offs between benefits and costs.

   a. true   b. false

Q17. In doing benefit-cost analysis, you often encounter situations where an element of the analysis can be treated as either a cost or benefit.

   a. true   b. false

Q26. An assessment of high impact project requirements finds that the following requirements have varying beneficial impacts (indicated by percentage figure in parentheses). The Pareto Rule suggests which requirements should be addressed first?Requirements and their corresponding beneficial impacts: A (2%), B (50%), C (2%), D(5%), E(10%), F(1%), G (30%), H (1%), I (2%), J(2%)

   a. A, C, F, H, I, J   b. B, G   c. B, G, E   d. A, B, E

Q30. James increases the price of a widget from $10 to $12. As a result, sales drop from $10,000 to $7,000. Price elasticity here is:

   a. 0.67   b. 1.00   c. 1.50   d. 2.00

Q32. At the beginning of the year, Hank puts $100,000 into an investment. At the end of the year, the investment is completed and he is given a check for $110,000. Meanwhile, Susan puts $100,000 in another investment, and receives $140,000. In retrospect, what was Hank's opportunity cost?

   a. $30,000   b. $40,000   c. $100,000   d. $110,000