I can’t help you but here are some notes I took on the topic
Let P = percent of discount
(290-188)/290 = P/100
102/290 = P/100
290P = (102)(100)
290P = 10,200
Solve for P to find your answer.
If it doesn't have a line above it in the problem then it is rational. This is because it ends and doesn't repeat on forever like 1/3 or pi.
Answer is : -7
Reason: 5(-2)=-10
-10+3=-7
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