Question

If 1,000 liters of oil are sold at $13,000, how much will it cost if they are sold at a 10% discount?

Answer 1

Recall that the x% of y can be computed using the following expression:

`y\cdot(x)/(100)\text{.}`

If the oil will have a 10% discount, then it will cost 90% of its original price.

Now, 90% of 13000 is:

`13000\cdot(90)/(100)\text{.}`

Simplifying the above expression we get:

`130*90=11700.`

Answer: If the oil will have a 10% discount, then it will cost $11,700.