214 FARM ARITHMETIC. 



per acre. What is the total cost per acre, including 

 the initial cost of $64.45 per acre for the land, labor, and 

 cost of trees, and compound interest at 3 per cent during 

 the entire period? 



769. Measurements made by the Bureau of Forestry 

 have shown that the loss from cutting high stumps in a 

 tract of 100,000 acres in the Adirondacks is a total of 



HEAVY LOGS EN ROUTE TO MARKET. 

 In this load are 5,540 feet. 



30,000 standards. When a standard is worth 50 cents 

 what is the loss for the tract of land ? 



770. The average number of ties to each mile of rail- 

 road track in the United States is 3,000. How many ties 

 are in use now, the railroad trackage being 250,000 miles ? 



771. The average life of railroad ties is six years. 

 What number of ties must be replaced each year ? 



772. The average cost of a railroad tie is 30 cents, 



