Explanation:
The hundredth place is the second number to the right of the decimal place (e.g., in ab.cd, where a, b, c, and d represent digits, the hundredth place is d).
When we round to the nearest hundredth, we remove all digits after the thousandth place. Then, if the thousandth place is 5 or greater, we remove it and add 0.01 (round up); if the thousandth place is 4 or lesser, we remove it (round down).
Thus:
50.30=50.30, as there is no thousandth place
50.20=50.20, same reasoning
56.90=56.90, same reasoning
49.50=49.50, same reasoning
51.10=51.10, same reasoning
30.00=30.00, same reasoning