Given:
The cost price of the deck of cards is $72.78 dollars.
Mark up percent is 5%.
a) To find the amount of mark up:
So, we can write it as,

Thus, the amount of mark-up is $3.64 (rounded to the nearest hundredth).
b) To find the new price:
The new price = Cost price + Amount of mark up
So, we get,

Thus, the new price is $76.42.