英语翻译

英语翻译
英文翻译成中文-适当解释一下公式
A profitable ad copy with high ROI is represented by a bar with green highlight.The unprofitable one is represented by the ROI bar with gray highlight.
ROI is computed as follows:
ROI = (Days Seen * Percentage Seen) /
Number of Days Seen since Last Seen
Example:
An ad copy for the keyword “Send Flowers...” was seen 15 days out of 20; the ad copy was seen 2 days ago
Number of Days Seen:15
Percentage Seen:15/20= 75%
Number of Days since Last Seen:2 Days
ROI = (15*75%)/2 = 5.6
岳紫莎的回答是机器的很浮云。