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To find the cost of purchasing 10 packs of paper and 30 notebooks, we substitute p = 10 and n = 30 into the expression 1.25p + 2.5n:
1.25(10) + 2.5(30) = 12.5 + 75 = 87.5
Therefore, it will cost Mr. Imani $87.50 to purchase 10 packs of paper and 30 notebooks.