208 Testing Milk and Its Products. 



238. Relative-value tables. These tables give many 

 of the multiplications used in computing the amount 

 due for various weights of milk testing from 3 to 6 per 

 cent, of fat. They can easily be constructed by any one 

 as soon as the price of one pound of fat is determined 

 in each case. If the price to be paid per pound of fat 

 is, say 15 cents, the value of each 100 Ibs. of milk of 

 different quality is found by multiplying its test by 15. 

 If the average tests of the different patrons' milk vary 

 from 3 to 5 per cent., the relative-value table would be 

 as follows. 



3.0X15=45c. per 100 Ibs. 



3.lXl5=46.5c. 



3.2Xl5=48c. 



3.3X15r=49.5c. 



3.4X15=51c. 



3.5X15=52.5c. 



3.6Xl5=54c. per 100 Ibs. 

 3.7Xl5=55.5c. " 

 3.8Xl5=57c. " 



3.9Xl5=58.5c. " 

 4.0Xl5=60c. " 



etc. 



By continuing this* multiplication, or adding the mul- 

 tiplier each time for each tenth of a per cent, up to 5 

 per cent, of fat, a table is made that can be used for 

 calculating the amount due per 100 Ibs. of milk, at this 

 price per pound, and the weight of milk delivered by 

 each patron is multiplied by the price per 100 Ibs. of 

 milk shown in the table opposite the figure representing 

 his test. 



Example: A patron supplies 2470 Ibs. of milk, testing 3.2 

 per cent, of fat; price per pound of fat, 15 cents; he should 

 then receive 24.70X.48=$11.85 (see above table). Another pat- 

 ron delivering 3850 Ibs. of milk testing 3.8 per cent, will re- 

 ceive, at the same price per pound of fat, 38.50X.57=$21.94. 



The relative-value tables in the Appendix give the 

 price per 100 Ibs. of milk testing between 3 and 6 per 

 cent, fat, when the price of three per cent, milk varies 

 from 30 to 90c. per 100 Ibs. In using the tables, first 



