If the probability of success is 30%, then p=0.3 and q=1-p=1-0.3=0.7.
The probability of no failures in five trials in binomial experiment is
.
In percent this is 0.00243·100%=0.243%=0.2% (rounded to the nearest tenth of a percent).
Answer: The probability of no failures in five trials is 0.2%.