To find unit rate:
divide the top number by the bottom number
the fraction in this problem is 67.50/9
so you divide 67.50 ÷ 9 = 7.5
since the unit rate we are looking for happens to be money, you have to have 2 digits after the decimal, so add a zero to make 7.5 into $7.50
It is $7.50 per pizza, so the correct answer is D.
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