The cost of the packs of cards that Mike bought can be calculated by adding up the value of the coins he used to pay for them.
1 quarter is worth 25 cents.
2 dimes are worth 2 * 10 cents = 20 cents.
4 nickels are worth 4 * 5 cents = 20 cents.
4 pennies are worth 4 cents.
So, the total value of the coins that Mike used to pay for the packs of cards is 25 + 20 + 20 + 4 = 69 cents.
Therefore, the cost of the packs of cards that Mike bought was 69 cents.