第十题求解答
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设税收额为 x
x = (100-10p) * 60 * 10000 * p%
= p(10-p) * 60000 [元]
1)
x >= 960000
p(10-p) >= 16
p^ - 10p + 16 <= 0
(p-2)(p-8) <= 0
2<= p <= 8
2)
x = 60000 * p (10-p)
ab <= (a+b)^2/4, 当且仅当 a = b 取等号
p * (10-p) <= 100/4 = 25, 当且仅当 p = 10 - p 即 p = 5 时取等号
当 p = 5, 即税率 5% 时,年税金最大,为:
x = 6 * 25 = 150 [万元]
x = (100-10p) * 60 * 10000 * p%
= p(10-p) * 60000 [元]
1)
x >= 960000
p(10-p) >= 16
p^ - 10p + 16 <= 0
(p-2)(p-8) <= 0
2<= p <= 8
2)
x = 60000 * p (10-p)
ab <= (a+b)^2/4, 当且仅当 a = b 取等号
p * (10-p) <= 100/4 = 25, 当且仅当 p = 10 - p 即 p = 5 时取等号
当 p = 5, 即税率 5% 时,年税金最大,为:
x = 6 * 25 = 150 [万元]
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