50

50.00 (4 significant figures)

there are 4 in ##50.00##. The zeros in this number are trailing zeros in a number that has a decimal point.

There are 3 types of zeros:

1)Leading zero : Do not count as a significant figure.Example: 0.001 (1 significant figure), 0.2 (1 significant figure)

2)Captive zero: Always count as a significant figure.Example: 709 (3 significant figures)

3)Trailing zero: Counts as a significant figure if the number contains a decimal point. However, it does not count if the number does not contain a decimal point.Example: 50.00 (4 significant figures), 50 (1 significant figure), 50. (2 significant figures).