In MySQL DB....
decimal(4,2) allows entering only a total of 4 digits. As you see in decimal(4,2), it means you can enter a total of 4 digits... out of which two digits are ment for keeping after the decimal point.
So, if you enter 100.0 in MySQL database, it will show an error like "Out of Range Value for column".
So, you can enter in this range only .... 00.00 to 99.99