8 The Bulletin. 



In Mixed Fertilizers. 



For phosphoric acid 4i^ cents per pound. 



For nitrogen 21 cents per pound. 



For potash 5 cents per pound. 



HOW RELATIVE VALUE IS CALCULATED. 



• 



In the calculation of relative value it is only necessary to remember 

 that so many per cent means the same number of pounds per hundred, 

 and that there are twenty hundred pounds in one ton (2,000 pounds). 



With an 8-2-1.65 goods, which means that the fertilizer contains avail- 

 able phosphoric acid 8 per cent, potash 2 per cent, and nitrogen 1.65 per 

 cent, the calculation is made as follows : 



Value Per Value Per Ton, 

 Percentage or Lbs. in 100 Lbs. iqO Lbs. 2,000 Lbs. 



8 pounds available phosphoric acid at 4i^ cents 0.36 X2{t= $ 7.20 



2 pounds potash at 5 cents 0.10 X2a=i 2.00 



1.65 pounds nitrogen at 21 cents 0.347X20= 6.94 



Total value 0.817X20= $16.14 



Ereight and merchant's commission must be added to these prices. 



