// Sample input file for invoice.cpp:
// (excluding this header, of course)
4331  3   9.97
7335  1   2.23
7338  2   1.00
7339 10   0.75
7350  6   2.98
3110  1  19.99
4132  1   5.67
5001  1   7.95
1234  4   1.75