Stat crunch in a random sample of 200 adults, what is the probability that less than 33% have no credit cards?

The answer is 50adults
to answer this question, u can use:
is over of equals to percent over hundred.
so, 
is       %
__ = ___
of     100
so "is" is unknown which is going to be replaced by n
and of is 200
% is 30 
and 100 is 100
so,
  n      30%
___ = ___
200    100
so solve this u do cross simplify.
200x30 = 100n
5000 = 100n
n=50
so the answer is 50 adults

Aso sorry if i’m wrong