Answer:
50%
Step-by-step explanation:
The next table display all possible outcomes.
penny | dime
head | head
head | tail
tail | head
tail | tail
If each single outcome is equally likely and there are 4 options , then all outcomes has a probability of 1/4 = 0.25 or 25%. The probability of getting one head and one tail is 50% because it's obtained by two outcomes.