Lets use a simple rule of three, direct proportion to solve the problem, supposing that 230 is the 100 percent:
230 ------> 100%
69 --------> x
x = (69)(100)/230
x = 30
therefore 69 is the 30% of 230
Another way to solve it is with fractions, you have this two fractions:
230/100 = 69/y
so we solve for y:
y = 69*100/230
y = 30