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To evaluate the expression 1.25p + 2.50n, we substitute p = 10 and n = 30:
1.25(10) + 2.50(30) = 12.50 + 75 = $<<1.25*10+2.5*30=87.5>>87.50
Therefore, it will cost Mr. Imani $87.50 to purchase 10 packs of paper and 30 notebooks.