Re: [計量] 請教一下數學題目
※ 引述《stanleyljs ()》之銘言：
: At acertain supplier,a machine of type A costs $20,000 and machineof type B
: costs $50,000.Each machine can be purchased by making a 20% down payment and
: repaying the remainder of the cost and the finance charges over a period of
: time. If the finance charges are equal to 40% of the remainder of the cost,
: how much less would 2 machines of type A cost than 1 machine of type B under
: this arrangement?
: A $10,000
: B $11,200
: C $12,000
: D $12,800
: E $13,200
: 我的算法是
: 2*(20000*0.8+20000*0.2*1.4)-(50000*0.8+50000*0.2*1.4)=10800
: 可是找不到答案,正確解答是(E)
: 有人可以幫我解惑嗎?
A 20000+ 利息16000X40%=26400
兩台A 26400X2= 52800
B 50000+ 利息40000X40%=66000
66000-52800= 13200 解
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