[計量] 請問一題數學
After paying a 12.5 percent tax on all income in excess of $4000
for the year, Simon had a net annual income of $21500.
What was his average income per month before taxes?
請問計算過程是如下: (不好意思，我計算很弱才死在這@@)
x-(x-4000)*0.125=21500
x-0.125x+500=21500
0.875x=21000(就是卡在這,我老是算錯@@)
x=24000 再除12=2000
答案是2000沒錯...
麻煩各位大大，謝謝~
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