Mr Goodwyn cm a Method of Calculating Interest. 367 
Circulating Digits of the Decimals, 
AT 
£ 1 jper C'e.nt. per Annum. £ 5 per Cent, per Annum. 
a 
b 
c 
d 
e 
/ 
g 
h 
a 
h 
c 
d 
e 
/ 
g 
h 
J 
6 
2 
7 
3 
9 
7 
2 
6 
A 
0 
1 
3 
6 
9 
8 
6 
3 
B 
6 
5 
4 
7 
9 
4 
5 
2 
B 
0 
2 
7 
3 
9 
7 
•2 
6 
C 
0 
8 
2 
1 
9 
1 
7 
8 
C 
6 
4, 
1 
0 
9 
.5 
8 
9 
D 
i 
0 
9 
5 
8 
9 
0 
4 
D 
0 
5 
4 
7 
.9 
4 
5 
2 
E 
i 
3 
6 
9 
8 
6 
3 
6 
E 
6 
6 
8 
4 
9 
3 
1 
5 
F 
i 
6 
4 
3 
8 
3 
5 
6 
F 
6 
8 
2 
1 
9 
1 
7 
8 
G 
2 
4 
6 
5 
7 
5 
3 
4 
G 
i 
2 
3 
2 
8 
7 
6 
7 
H 
3 
2 
8 
7 
6 
7 
1 
2 
H 
i 
6 
4 
3 
8 
3 
5 
6 
I 
4 
9 
3 
1 
5 
0 
6 
8 
I 
2 
4 
6 
5 
7 
5 
3 
4 
The method of using the Table, will be understood from the following 
RULES AND EXAMPLES. 
The complete decimal of the interest on £ 1 for any given number of days less than a 
year, at the rate of £ ui per cent, per annum, may be found by inspection : thus, 
Seek the given number of days, in one of the day columns ; and take out the 
j- decimal digits which are placed j" column in which the 
number of days is found. Observe the two letters that follow in the same horizontal line 
with the number for the days. At the angle of meeting of these two letters in the Tablets for 
the circulating digits of the decimals at £ {1} per cent, per annum, is the first digit of 
r three ^ 
that circle, which, when annexed to the -j J- decimal digits already found, will produce 
the complete decimal expression for the interest required. 
Example — Required the interest on £ 1, at £ U} per cent, per annum, for 155 days. 
UnXr j” tw^^ I *0^^ I” ° ^ 
ters G a, and at the angle of meeting of these two letters in the Tablets of Circulating Digits 
{f}„f the O.V.J 24657584 1 
at £ 
{J} 
per cent, is the figure 
annexed to 
I -004 I 
I -02 I 
, will be the answer. Thus 
I i23287,67 f 
^ f •004il657534| 
’ 1 'OSi 2328767 j 
, which, being 
, that is, 
£' 00424657534, at £1 per cent.; and £ *02123287675 at £ 5 perct. is the Answer. 
When the principal is greater or less than £1, or the rate greater or less than 1 per 
cent, the interest is first to be found for the given number of days, as if for £ i, at 1 per 
cent. This interest, multiplied by the given principal, or by the given rate, or by both, as 
the case may be, will give the answer required respectively. Thus, 
Since *00424657534 is the interest of £ 1, at 1 per cent, for 155 days ; 
*00424657534 x 400 = 1*698630136 win be the interest of £400 at the 
same rate and for the same time. 
Also, *00424657534 X 5= *0212328767 is t^e interest of £ 1 for 155 days, at 
£ 5 per cent as found above from the Table. 
And *00424657534x400x5=8*49315068 shows the interest of £'400 at 
£ 5 2 }er cenh for 155 days. 
