# The Columbian Calculator; Being a Practical and Concise System of Decimal Arithmetic Adapted to the Use of Schools in the United States

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1848 edition. Excerpt: ...days, at 6 per cent. per annum. 365 days. 700 dollars. 700 dollars. 6 ratio. 255500 D42.00 proof. D. 365)1533000(42.00 Ans. 3. Required the interest of D150 for 63 days, at 6 per cent Ans. D1.55.3 + 4. What is the interest of D250 for 60 days, at 4.5 per cent.? Ans. D1.84.9+ 5. What is the interest of D104.25 for 90 days, at 5 per cent.? Ans. D1.28.5 6. What is the interest of D85 for 30 days, at 7 per cent.? Ans. c.48.9 7. What is the interest of D40 for 50 days, at 9 per cent.? Ans. c.49.3 8. Required the interest on a bond for D45, for 150 days, at 5 per cent. Ans. c.92.4. 9. Required the interest of D300 for 180 days, at 7 per cent. Ans. D10.35.6.. 10. Required the interest of D342.76 for 176 days, at 7 per cent. Ans. Dl 1.98.2 + 11. What is the interest of D989.94 for 489 days, at 5\$ per cent.? Ans. D72.94.3+ 12. What is the amount of D289.64 for 579 days, at 16 per cent.? Ans. D365.45. Interest for months, weeks, d.c. RULE II. 1. At 6 per cent., each dollar will draw J cent a month, therefore multiply by half the number of months; the product will be in cents, which is the answer. 2. For the interest at any other rate per cent., take aliquot parts of the interest at 6 per cent., and add it or subtract it as the case requires.: 3. Or you can state the question in compound proportion. 13. Required the interest of D100 for 10 months, at 6 and 7 per cent., .': ' 100 D.... 5 half no. mo.; J)5.00 at 6 per cent. +83.3 D5.83.3 at 7 per cent.. 14. What is the interest of D94.50 for 19 months, at 9 per ct.? Thus: 100 D.: 94.50 D.:: ) _.. 12 mo. 19 I 9raU0., ' Or, 94.50 D.;, 9.5 half no. mo. 15. What is the interest of D649.76 for 74 months at 6 per cent.? X37. Ans. D240.4.1.1. 16. What is the interest of D331.42 for 150 weeks at 7 per cent.? D100.