Answer :
Recall that the x% of y can be computed using the following expression:
[tex]y\cdot\frac{x}{100}\text{.}[/tex]If the oil will have a 10% discount, then it will cost 90% of its original price.
Now, 90% of 13000 is:
[tex]13000\cdot\frac{90}{100}\text{.}[/tex]Simplifying the above expression we get:
[tex]130\times90=11700.[/tex]Answer: If the oil will have a 10% discount, then it will cost $11,700.