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Okay, well we're gonna find the LCM (least common multiple)
3: 3, 6, 9, 12, 15, 18, 21
7: 7, 14, 21
So...21 days
Add together the values to get the total cost
Then divide the discount by the total cost to find the percentage
(Updated - look at comments)
Answer:
The first and second one
Step-by-step explanation:
plug in x :)
