If a magazine can issue 100000 copies at the price of 2 yuan per copy, if the price of each copy is increased by 0.2 yuan, the circulation will be reduced by 5000 copies. In order to make the total income not less than 224000 yuan, what is the price of the magazine? (the answer is 2.8 yuan ~ 3.2 yuan)

The meaning of the title is x [100000-5000 (X-2) / 0.2] ≥ 224000
25x2-150x + 224 ≤ 0
According to the root formula, the root of 25x2-150x + 224 = 0 is
X = [150 ± √ (1502-4 * 25 * 224)] / (2 * 25) = (150 ± √ 100) / (2 * 25) = 2.8 or 3.2
So 2.8 ≤ x ≤ 3.2

128 times 88=

=(120+8)×88
=120×88+8×88
=120×(90-2)+8×(90-2)
=120×90-120×2+8×90-8×2
=10800-240+720-16
=10560+720-16
=11280-16
=11264

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