how can i get 78 cents by only using 7 coins?

50 + 10 + 10 + 5 + 1 + 1 + 1

There are still 50 cent pieces in circulation

To get 78 cents using only 7 coins, you can use the following combination:

1. Use one 50 cent piece.
2. Use two 10 cent coins.
3. Use three 1 cent coins.
4. Use one 5 cent coin.

This combination will give you a total of 78 cents using only 7 coins.

Please note that the availability of different denominations of coins may vary depending on the country you are in. In some countries, 50 cent pieces may not be in circulation anymore.