If the amount she saved was $6 for 20%, then the formula for finding savings would be cost*percentage.
But if you want to find the original cost, then you play with the current formula until you get this. $6/20%. Have a good one :)
Answer:
9<n<17.
Step-by-step explanation:
(-2 ,-15)
(-1, -7)
(0,1)
(1, -7)
(2, - 15)