Final answer:
When the input is 30%, the expected output of the algorithm is "Wait for a better sale," as 30% is less than the required 50% for a "Great deal!" message.
Step-by-step explanation:
The expected output for the algorithm when the input is 30 would be considered based on the conditional statement given. If the discount is greater than 50%, the output should be "Great deal!", otherwise the output should be "Wait for a better sale." Since the input is 30%, which is less than 50%, the appropriate output would be "Wait for a better sale."