Consider the following two investment alternatives given in the table below. The firm's MARR is known to be 15%. Click the icon to view the interest factors for discrete compounding when (a) Compute PW(15\%) for project A1. PW(15\%) for project A1 is \$ (Round to the nearest dollar.) (b) Compute the unknown cash flow X in years 2 and 3 for project A2. x=$ (Round to the nearest dollar.) (c) Compute the project balance (at 15\%) of project A1 at the end of period 3. The project balance (at 15\%) of project A1 at the end of period 3 is $ (Round to the nearest dollar.)