Write the ratio as a fraction in simplest form, with whole numbers in the numerator and denominator. $4.50 : $2.50

The answer is:  " 9/5 " .

Explanation:

4.50 / 2.50 = 4.5/2.5  ; {Note:  the "zeros" cancel out.}.

Now, we can multiply Both the numerator AND the denominator by "10"
(note that we multiple both the numerator AND the denominator by the same number to retain the same value); to "eliminate the decimal points" ;

4.5/2.5 = (4.5 * 10) / (2.5 *10) = 45/25 .

Now, we can further simplify this ratio; as we would a fraction, by dividing both the numerator AND the denominator by "5" ; as follows:

(45÷5) / (25÷5) = 9/5  ; which is our answer; since the question asks to "write as a fraction, in simplest form, with a whole number in BOTH the number and the denominator.

The answer is:  " 9/5 " .