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Answer: S x 1.25 = A
Step-by-step explanation:
Where S is the number of students and A is your final price. If each book cost 1.25, then she will have to pay 1.25 for every kid.
1, 3, and 5 are the odd numbers so the fraction would be 3/5. If you multiply the numerator and denominator by 20 you get 60/100, which would give you 60%