SOLUTION: Sandy Lindelof installed an electronic alarm and several simple auto-theft devices in her car. As a result her auto insurance policy premium was reduced by 14.2% to $137.79 per mo

Question 425173: Sandy Lindelof installed an electronic alarm and several simple auto-theft devices in her car. As a result her auto insurance policy premium was reduced by 14.2% to $137.79 per month. Find the amount of her insurance premium before installing these devices.
I am having trouble with the fomula
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Sandy Lindelof installed an electronic alarm and several simple auto-theft devices in her car. As a result her auto insurance policy premium was reduced by 14.2% to $137.79 per month. Find the amount of her insurance premium before installing these devices.
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Let original premium be "x"
Equation:
x - 0.142x = 137.79
0.858x = 137.79
---
Original premium = x = $160.59
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Cheers,
Stan H.
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