INTEREST. 
TABLE, 
Shewing the Simple Interest of One Pound for any Number of Days, at 5 per Cent. 
per Annum. 
Days. 
Amount. 
Da v • . 
Amount. 
Days. 
Amount. 
Days. 
Amount. 
i 
.0001369 
27 
.0036986 
53 
.0072602 
78 
.0106849 
2 
.0002739 
28 
.0038356 
54 
.0073972 
79 
.0108219 
3 
.0004109 
29 
.0039726 
55 
.0075342 
80 
.0109589 
4 
.0005479 
30 
.0041095 
56 
.0076712 
81 
.0110958 
5 
.0006849 
31 
.0042465 
57 
.0078082 
82 
.0112328 
6 
.0008219 
32 
.0043835 
58 
.0079452 
83 
.0113698 
7 
.0009589 
33 
.0045205 
59 
.0080821 
84 
.0115068 
8 
.0010958 
34 
.0046575 
60 
.0082191 
85 
.0116438 
9 
.0012328 
.0013698 
35 
.0047945 
61 
.0083561 
86 
.0117808 
10 
36 
:0049315 
62 
.0084931 
87 
.0119178 
11 
.0015068 
37 
.0050684 
63 
.0086301 
88 
.0120547 
12 
.0016438 
38 
.0052054 
64. 
.0087671 
89 
.0121917 
13 
.0017808 
39 
.0053424 
65 
.0089041 
90 
.0123287 
14 
.0019178 
40 
.0054794 
66 
.0090411 
91 
.0124657 
15 
.0020547 
41 
.0056164 
67 
.0091780 
92 
.0126027 
16 
.0021917 
42 
.0057534 
68 
.0093150 
93 
.0127397 
17 
.0023287 
43 
.0058904 
69 
.0094520 
94 
.0128767 
18 
.0024657 
44 
.0060274 
70 
.0095890 
95 
.0130137 
,19 
20 
21 
22 
23 
24 
25 
26 
.0026027 
.0027397 
.0028767 
.0030137 
.0031506 
.0032876 
.0034246 
.0035616 
45 
46 
47 
48 
49 
50 
51 
52 
.0061643 
.0063013 
.0064383 
.0065753 
.0067123 
.0068493 
.0069863 
.0071232 
71 
72 
73 
74 
75 
76 
77 
.0097260 
.0098630 
.0100000 
.01013fi9' 
.0102739 
.0104109 
.0105479 
96 
97 
98 
99 
100 
200 
300 
.0131506 
.0132876 
.0134246 
.0135616 
.0136986 
.0273972 
.0410958 
Ex. 1. What is the interest of 250 Z. for 63 
days i 
.0086301 X 250 =s 2 Z. 3s. 1 -}d. 
The interest for any number of days not 
specified in the table, may be easily found 
by adding two of the numbers contained in i t. 
Ex. 2. What is the interest of 115Z. for 
237 days ? 
The interest of 1Z. for 200 days is 
\ .0273972, and for 37 days .0050684, 
which added together make .0324656; 
therefore, 
.0324656 X 115 = 31. 14s. 3d. = the 
interest required. 
By the act of 12 Anne, no person is to 
take for the loan of money, above 5Z. for the 
interest of 100Z, for a year ; and all notes, 
bonds, or other contracts, made for money 
at a greater rate of interest, are to be void, 
and the offender to forfeit treble the value. 
Interest, compound, is, allowing inte- 
rest upon interest, or, adding the interest as 
it becomes due to its principal, and consider- 
ing the whole as a new principal bearing in- 
terest at the same rate as before. Let r now 
represent the amount of one pound in one 
year, that is, principal and interest ; let n = 
the number of years ; p = the principal ; 
a — the amount. Then, 
1 : r : : r : r 1 the amount of 1Z. in 2 years 
1 : r : : r 2 : r 3 the amount of 1 Z, in 3 years 
1 : r : : r 3 : r 4 the amount of lZ. in 4 years, 
&c. 
Whence it appears, that r raised to the 
power whose exponent is the given number 
of years, or r n , will be the amount of 1Z. in 
those years ; and as 
1Z. : r n : :p : a 
from which the following theorems are .ea- 
sily deduced, viz. if the principal, time, and 
rate of interest are given, to find the 
amount ? 
Theo. 1. p X r” = a 
If the amount, time, and rate are given, to 
find the principal ? 
Theo. 2. ~—P 
If the principal, amount, and time are 
given to' find the rate ? 
Theo. 3. \/ - = r 
V 
