It is 100.
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It depends on how tightly clustered the observations are. The answer would be different if the observations were 100, 102, 104, 107, 110, ... as opposed to 100, 150, 150, 150, 150, ... , 150, 220!
The percent increase from 50 to 150 is: 200%
A propotion is a math method. For example 3 over 100 = x over 50, you crossmultipy both 3 times 50 and 100 times x, then you'll get 150 = 100x, then you have to get x by itself so you divide 100 from both sides and that leaves you with x = 1.5 The proportion in this problem is 3 over 100 = x over 50
It is: (150-75)/75 times 100 = 100% increase
% rate = 47/150 * 100% = 31.33%