earn $40 a week as a "mule spinner." Should he be so successful as this, what would have been his average yearly increase in income for the 12 years? *13. From the cotton mill, the cloth goes to the "printer," who prints the design or pattern on the cloth. If the cloth before printing is sold for 11¢ a yard, and 7 yd. of the goods weigh a pound, find how much the manufacture of the cloth has cost (including the manufacturer's profit), when the cotton of which the cloth is made cost 25¢ a pound. *14. After the cloth is printed, it goes to the wholesaler, who, in turn, sells it to the retailer. If the printer receives 13¢ a yard for printing, and the wholesaler also receives 13¢ a yard, what per cent of gross profit on the cost does the retailer make when he sells the cloth at 20¢ a yard? 56. The Manufacture of Railway Locomotives [Use pencil only when needed.] 1. One of the largest plants in the United States for manufacturing locomotives consumes, on an average, 4200 tons of coal a week. What is the company's coal bill per week if 90% of the coal used is soft coal at $2.85 a ton; 3% of it hard coal at $5.95 a ton; and the rest buckwheat coal at $3.40 a ton? What is the total expenditure for coal per week? Per year? 2. The company used in one week 1800 tons of pig iron at $28 a ton, 180 tons of bar iron at 2¢ per pound, and 4500 tons of steel at 2.4¢ per pound. What was their total expense for iron and steel for the week? At the same rate, what would be the cost of a year's supply? (Pig iron is sold at 2240 lb. to the ton; bar iron and steel, at 2000 lb. to the ton.) 3. Thirty-two boilers, averaging 400 horsepower each, produce the steam required for generating the electricity for lighting the plant and for power. What is the total horsepower produced? 4. It took this plant nearly a year to build their first locomotive. How many locomotives do they now build in a year at the rate of 9 per day, Sundays excluded? (Allow for 52 Sundays in the year.) 5. The weight of a locomotive built by this company is 180,000 lb. on the driving wheels, 52,000 lb. on the front truck, and 57,000 lb. on the trailing wheels. How many tons does it weigh? 6. The cost of a locomotive is about 18¢ a pound. Find the cost of the locomotive referred to in problem 5. 57. Study of Local Industries Visit some of the leading local industries and business houses, or, if in a rural community, study some of the various branches of agriculture, to obtain facts and figures for problems. Bring these problems to class and have them solved by your classmates after you have first explained how the industry or business is carried on. You will thus be helping yourself and your classmates, not only to become intelligent about local enterprises, but also to prepare for successful business careers. ARITHMETICAL GYMNASIUM GRADED PRACTICE FOR SKILL IN COMPUTING 1 Use these exercises to overcome any weaknesses in the essential processes and to strengthen your ability in computing accurately and rapidly. I ADDITION A. Practice on each of these exercises until you can add the columns within the time limit. Add at a steady rate. 3. Time limit, 1 to 2 minutes for 5 problems. 5 7 6 727818∞1 59273961 98880951 8679574 0 66877-8691 1 For directions for using these exercises, see page 37. |