I think it's 56y + 7, is what I'm pretty sure of.
To get 63/80 converted to decimal, you simply divide 63 by 80. Don't worry. You don't need to get the calculator out, because I did this for you.
63/80 as a decimal is:
<span>0.787500</span>
30%.
6 nickels equal 30 pennies, and 100 pennies make up a dollar.
30/100 = 30%.
