if the original quantity is 12 and the new quantity is 15, what is the percentage increase? The percent increase is___​

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Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7