问题如下：
A company's quick ratio is 2. If the company purchased some computer paid by cash recently, the quick ratio will:
选项：
A. decrease.
B. increase.
C. unchanged.
解释：
A
Quick ratio = (cash + AR) / current liabilities. If cash decreases, then the numerator decreases and the denominator is unchanged, the quick ratio will decrease.
请问为什么不用Quick ratio=（current asset-inventory）/current libilties 这个公式
