i68 FARM AND SCHOOL PROBLEMS. 



tively, 392 trees and 616 trees per acre. The average height of the trees 

 in the first grove was 47 feet ; those in the second grove were 55 feet. 

 The product per acre of the first grove were 1,515 first-class posts and 

 320 second class posts; the product of the second grove were 1,930 first- 

 class posts and 540 second-class posts per acre. If the first-class posts 

 were worth 12c per post and the second-class posts were worth 9c a piece 

 what was the value of the posts per acre of each of the two groves? 

 What was the difference in value between an acre from the first grove 

 and an acre from the second grove? 



2. A plantation in Sangamon Co., 111., in which the original spacing 

 was 4 by 5 feet, contained at 21 years of age 800 trees per acre ; the yield 

 was 1,920 posts per acre ; they were all first class ; what was the average 

 number of posts per tree and the value of an acre of trees at '25c each? 



3. A 25-year-old plantation in Nebraska yielded 1,829 first-class and 

 854 second-class posts per acre; what was the total value at lOc for firsts 

 and 8c for seconds per acre? 



4. In a plantation in Pawnee County, Nebr., the owner kept a strict 

 account of all expenses incurred in establishing, maintaining, and harvest- 

 ing his plantation and of the final proceeds. The seedling trees, at $1.15 

 per thousand, cost $3.13 an acre; the preparation of the ground, plant- 

 ing, cultivating, and pruning cost $18.46 a total of $21.59 per acre. At 

 5 per cent compound interest this was increased, in the 16 1/3 years 

 during which the plantation grew, by $26.34. Cutting and marketing 

 the crop added $61.90 per acre to this, so that the full cost at the end of 

 the experiment for the 20 acres was $2,196. 



The returns were: 



31,397 third-class posts, at 5 cents $1,569 85 



17,349 second-class posts, at 10 cents 1,73490 



4,268 first-class posts, at 12 cents 533 50 



270 first-class posts, at 15 cents 40 50 



211 8-foot posts, at 20 cents 42 20 



9 10-foot posts, at 25 cents 2 25 



4 10- foot posts , at 30 cents 1 20 



258 10-foot posts, at 35 cents 90 30 



41 12- foot posts , at 40 cents 16 40 



167 14 and 16 foot poles, at 50 cents 83 50 



Total for posts and poles 4 , 114 60 



214 cords of wood, at $5.25 : 1,123 50 



Total income from 20 acres 5,23810 



What was the total profit for the 20 acres? 

 How much was the income per acre per year? 



