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To meet a government requirement, a bottler must test 5 percent of its spring water and 10 percent of its sparkling water for purity. If a customer ordered 120 cases of spring water and 80 cases of sparkling water, then what percent of all the cases must the bottler test before he can send it out ?
Options:
A .  6.5%
B .  7.0%
C .  7.5%
D .  8.0%
Answer: Option B

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