Orton's Lightning Calculator; And Accountant's Assistant
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. 1871 edition. Excerpt: ...for 45 days. Interest at 9 per cent. for 40 days. Interest at 10 per cent. for 36 days. Interest at 12 per cent. for 30 days. Interest at 7-30 per cent. for 50 days. Interest at 5-20 per cent. for 70 days. Interest at 10-40 per cent. for 35 days. Interest at 7J-per cent. for 48 days. Interest at 4 per cent. for 80 days. Note.--The figures on the left of the perpendicular line are dollars, and on the right decimals of $. If the $ are less than 10 prefix a 0. Example 1.--What is the interest of 8120 for 15 days at 4 per cent' $120=principal. 15= of 90.' 6)1 20 cts. int. for 90 days. 20 cts.-int. for 15 days. Example 2.--What is the interest of $132 for 13 days at 7 per cent.? Days. $132r=principal. 13= 4)1 32 cts.=int. for 52 days. 33 cts.=int. for 13 days. Example 3.--What is the interest of $520 for 9 days at 8 per cent.? Days. $520=principal. 9= 20 cts.=rint. for 45 days. 04 cts.=int. for 9 days. Example 4.--What is the interest of $462 for for 64 days at 7 per cent.? $6 16 cts.=int. for 64 days. Remark.--We have now illustrated several examples by the different per cents.; and if the student will study carefully the solution to the above examples, he will in a short time be very rapid in this mode of computing interest. Note.--The preceding mode of computing interest is derived and deduced from the canceling system; as the ingenious student will readily see. It is a short and easy way of finding interest for days when the days are even or aliquot parts; but when they are not multiples, and three or four divisions are ncessary, the canceling system is much more simple and easy. We will here illustrate an example to show the difference: Eequirod the interest of $420 for 49 days at 6 per cent. Bankers' method. Canceling moth. 20...
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- 04 Jul 2012
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