Answer:
Part A: pennies are 40% of the jar
Part B :
Nickels: 10
Quarters: 20
Pennies: 20
Explanation:
Part A: since the nickels and quarters make up 60% of the jar the pennies make up the other 40%.
Part B:
Nickels: 20 percent of 50 (the amount of coins in the jar) is 10
Quarters & Pennies (since they have the same percentage): 40 percent of 50 is 20