1. ## Percentages

I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

Thanks!!!

2. Originally Posted by Stella
I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

Thanks!!!
I assume that you pay your petrol in Australian Dollars?

If the price of one litre of petrol is below 100 cts = 1 \$ then 4 cts are more than 4 % of the petrol price.

3. Originally Posted by Stella
I need urgent help with this question: If you receive 4 cents off per litre of fuel pumped, when will you get more than 4% off the total price of the petrol you pump?

Thanks!!!
So let the cost of the petrol equal x cents

Then you are paying x-4 cents per liter

and you want to know when it hits 4 percent, so (1-.04)x = .96x

When these two are equal you will be getting 4% off (or think of it as paying 96%), so we set them equal and solve.

x-4 = .96x

x-.96x-4 = 0

.04x-4=0

.04x = 4

x= 100

So when x = 100 cents, then (4%)*100 = 4 cents

So any time the petrol is less than 100 cents per liter, we will get more than 4% off the total price of the petrol.