After find the amount that was deducted, we added this amount to the final amount to get the initial amount of petrol
The price before the cut is 90 cents
Given Data
Let the initial cost be x
Let us find 5% of x, this is so that we know how much was deducted from the initial amount
Amount deducted = 5/100*x
Amount deducted = 0.05x cents
We know that the initial amount is
x = Amount deducted + Final Amount
x = 0.05x + 85.5
let us find x
x-0.05x = 85.5
0.95x = 85.5
divide both sides by 0.95
x = 85.5/0.95
x = 90 cents
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