50 



THE AFFORESTATION OF SURPLUS LAND. 



means that all money is taken out of an investment which 

 gives 3 per cent. : 



Value of soil = 



3900 + 10 x (1-03) 50 + 76 x (1'03) 10 

 + 220 x (1-08) 80 + 270 x (1'03) 20 + 



300 x (1-03) 10 - 90 x (1-03) 70 4 



(1-03) 70 - 1 



OB 



If this calculation is carried out, we obtain 



Value of soil = 576s. = 28 16s. 



