Answer:
The program did not contain a data checking routine for input data.
Step-by-step explanation:
Data validation or data checking is the process by which data undergoes cleansing to ensure data quality.
Data that is checked is useful and correct.
When data is inputted into a program check for correctness and meaningfulness for that particular field.
In the given scenario the value that should appear in the quantity sold column should be a number. Alphabets cannot be used as value of quantity.
So the program does not have data checking routine that is why it accepted the value 2R5.