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SmarticalParticals

If the TV is 70% off, then that means she paid 30% of the original cost.  If 30% of the original cost  is $120, then...

30% * x = 120
.30x = 120
x = 120/.30
x = 400

The original cost was $400

original price x (100-70)/100 = $120

therefore; original price = 120 × 100/30 = $400

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