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There is a 68.75% increase in the amount of water Nathan drinks from his usual 32 ounces. If he started drinking 54 ounces of water per day, then there is a 22 ounce increase in intake. And 22 ounces is 68.75% of 54 ounces. This percentage would be derived by using the formula (54-32)/32.
The answer is D because using division you would find how many cups you need to sell.
