A drug loses decayrate percent of its potency every month. Also, a drug is considered expired if it loses more than 50% potency.

Your goal is boolean function IsExpired(months,decayrate) that returns True if the drug has expired and False if it has not.

Example 1:IsExpired(10,10) should return True.

Explanation:The drug loses 10% potency every month. After 1st month the potency is 90%, after 2nd month its 81%. In this way, after 7th month the potency is 47.83%.

Example 2:IsExpired(15,4) should return False.

\f