(a)(i) State the law of diminishing returns [2 marks} (ii) Explain the main cause of diminishing returns in agricultural production. [2 marks] (b) A commerc...

(a)(i) State the law of diminishing returns [2 marks} 
(ii) Explain the main cause of diminishing returns in agricultural production. [2 marks] 
(b) A commercial farmer bought a second hand combine harvester for N100,000.00 in 1990, and sold it for N30,000.00 in 2000. For the combine harvester (i) salvage value [1 marks] 
(ii) total depreciation [2 marks] 
(iii) annual depreciation [2 marks]
 (c) List seven problems of agricultural extension services in West Africa. [7 marks]