Reduce the time to months, and to the number thus found annex one-third of the days, which whole number multiplied by one-half of your principal will produce you the required interest in dollars, cents and mills, at 6 per cent. If days only are given, multiply one-third of the days by one-half of the principal for the required interest at 6 per cent. Note these exercises: $250 at 6% for 8 mos. 6 ds. = 82 × 125 = $10.25. $250 at 6% for 93 ds. = 31 × 125 = $3.88. $250 at 6% for 9 mos. = 9 × 125 = $11.25. In some respects this rule is superior to the well-known 60-day method of reckoning interest. Interest Computations. 462.50 .48 ------- 6 | 360 ---- 60 | 222.0000 | 3.70 Multiply the _principal_ (amount of money at interest) by the time, reduced to days; then divide this product by the quotient obtained by dividing 360 (the number of days in the interest year) by the per cent. of interest, and the quotient thus obtained will be the required interest. Require the interest of $462.50 for one month and eighteen days at 6 per cent. An interest month is 30 days; one month and 18 days equals 48 days. $462.50 multiplied by .48 gives $222.0000; 360 divided by 6 (the per cent. of interest) gives 60, and $222.0000 divided by 60 will give you the exact interest, which is $3.70. If the rate of interest in the above example were 12 per cent., we would divide the $222.0000 by 30 (because 360 divided by 12 gives 30); if 4 per cent., we would divide by 90; if 8 per cent., by 45; and in like manner for any other per cent. * * * * * OUR MAIL DIRECTORY. Every person who receives this copy of MULTUM IN PARVO LIBRARY will also receive the benefit of the publicity of our Mail Directory, under the following arrangement: We shall forward your name and address during the next two years to many concerns, including publishers, who will mail to you gratuitously sample copies of publications, circulars, catalogues, etc. You will doubtless receive a great many of such, and it may be well to remember that you are receiving them on account of this Directory of ours. * * * * * Transcriber’s Notes: Use of - to represent division in some expressions is standardized to /. The following change was made: p. 15: Extraneous numbers were removed from the example interest computation.