1. Modify Acron`s model so that development lasts for an extra year. Specifically, assume that development costs of $7.2million and $2.1million are incurred at the beginnings of years 1 and 2, and then the sales in the current model occur one year later, that is, from year 2 until year 21. Again, calculate the NPV discounted back to the beginning of year 1, and perform the same sensitivity analyses. Comment on the effects of this change in timing. 2. Modify Acron`s model so that sales increase, then stay steady, and finally decrease. Specifically, assume that the gross margin is $1.2million in year 1, then increases by 10% annually through year 6, then stays constant through year 10, and finally decreases by 5% annually through year 20. Perform a sensitivity analysis with a two-way data table to see how NPV varies with the length of the increase period (currently 6 years) and the length of the constant period (currently 4 years). Comment on whether Acron should pursue the drug, given your results. 3. Create a one-way data table in the Acron model to see how the NPV varies with discount rate, which is allowed to vary from 8% to 18% in increments of 0.5%. Explain intuitively why the results go in the direction they go- that is, the NPV decreases as the discount rate increases. Should Acron Pursue the drug for all of these discount rates?