Economics:

1. Annual profit before income taxes = 960000 - 620000 = 340,000

   Percent return on total initial investment before income taxes

   = 100 = 27 9%

   Answer is (B)

2. Annual profit after income taxes = (340000)( 0.52) = 176800

   Annual percent return on total initial investment after income taxes

   = 100 = 14.49 %

   Answer is (D)

3. Minimum profits required per year before income taxes

   • = (1100000 + 120000)(0.15) = $183000

   Fictitious expenses based on capital recovery with minimum profit

   • = 620000 + 183000 = $803000

   Annual % return on the total investment based on capital recovery with minimum 15 % return before income taxes

   100 = 12.87 %

   Answer is (D)

4. Average investment assuming straight-line depreciation and zero salvage value

   = + 120000 = $670000

   Annual % return on average investment before income taxes

   = 100 = 50.75 %

   Answer is (B)

Biochemical reactors:

1. Michaelis-Menton equation can be written by rearrangement as

   

   A plot of - vs should be a straight line if Michaelis-Menton is to apply. The plot given is a straight line. Slope of the line is and its intercept is

   Intercept of the line = k ₃ = = 20.95 h ^-1

   Answer (A)

2. Slope of the line = = 1.1932

   Therefore, M = 1.1932(k ₃C _E0) = 1.1932(20.95)(0.01) = 0.25

   Answer (C)

1. The Michaelis-Menton rate expression

   This can be integrated with s(0) = s ₀