Answer:
18%
Explanation:
9÷50×100 = 18%
9 means how many students have pets
50 means how many students are in Mrs. Green's class
18% is how many students that have a pet in Mrs. Greens class
4.5% i think reason usually percent is compared in 100% and out of 100 10 means 10 % so 4.5 is the answer
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