Well, first off, you should know that the denominator of the fraction will be $1.00, since we're putting it in a fraction as a dollar.
2 quarters = $0.50
1 nickel = $0.05
4 pennies = $0.04
Now, we add them all together...
$0.50 + $0.05 + $0.04 = $0.59
The answer is $0.59 over $1.00. (This is in fraction form ... $0.59 is the numerator (the top number) and $1.00 is the denominator (the bottom number) .)