Final answer:
To find the percentage of coins that are pennies, divide the number of pennies by the total number of coins and multiply by 100. The correct answer is 40%.
Step-by-step explanation:
To find the percentage of coins that are pennies, we need to divide the number of pennies by the total number of coins and then multiply by 100.
The number of pennies is 240, and the total number of coins is 600.
So the percentage of coins that are pennies is (240/600) * 100 = 40%.
Therefore, the correct answer is option C) 40%.