What amount will be required to purchase, on an engineer's 40 th birthday, an annuity to provide him with 25 equal semiannual payments of $10,000 each, the first to be received on his 60 th birthday, if nominal interest is 4% compounded semiannually

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The correct answer is (b) the marginal contribution of labor decreases as the quantity of labor used in production increases;

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With reference to the solutions, following things may be noted1) homogeneous solutions comprises of single phase.2) heterogeneous solution comprises of more than one phase.3) in colloidal solution, solute is evenly distributed in solvent. in such system, it is difficult to separate solute and solvent.4) in suspension, there is an uneven distribution of solute in solvent. in such system, solute and solvent gets separated on standing long.    blood is a homogeneous and colloidal solution,salad dressing is a heterogeneous and suspension solution.