Interest calculator

Implement a program that calculates the interest produced from a total accumulated capital of an amount c, invested at an interest r (as a percentage) during t days. The formula used to calculate interest is:

\[I=\frac{c \times r \times t}{360 \times 100}\]

To test your program you can try with the following test cases:

test case ID	inputs			expected output
\(c\)	\(r\)	\(t\)
1	10000	5.5%	360	550 euros
2	25000	60%	45	1875 euros
3	0	50%	200	0.0
4	-2000	45%	2	-5.0
5	12.345	56.78%	900	17.0

Instead of sample executions for them to check, we add a table with
test cases. This teaches them what test cases are made up of:

-   identifier

-   inputs

-   expected outputs