[計量] 請教一下數學題目
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?
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