# Short Interest Rules

To find the interest on a given sum for any number of days, at any rate

of interest, multiply the principal by the number of days and divide as

follows:

At 3 per cent, by 120 At 9 per cent, by 40

At 4 per cent, by 90 At 10 per cent, by 36

At 5 per cent, by 72 At 12 per cent, by 30

At 6 per cent, by 60 At 15 per cent, by 24

At 7 per cent, by 52 At 20 per cent, by 18

At 8 per cent, by 45

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