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4. Find the value of A in the following cash flow diagram. Interest rate is i = 10% per year. A= ? $20,000 0 1 2 3 5 6 $18,000 $30,000 Note: Assume that Positive cash flow = Negative cash flow Note: 1. Show your calculations clearly. 2. Draw the cash flow diagram wherever necessary. 3. Comment on the results when it is appropriate. 1. stock fund. If his salary this year is $150,000 and he expects his salary to increase 6% each year, how much will A software engineer planning for his retirement will deposit 15% of his salary each year into a high technology