If there is an 9% tax
on a $18 football,
what is the tax
amount?

$1.62

Step-by-step explanation:

9% = 0.09

18 * 0.09 = 1.62

1.62

Step-by-step explanation:

To find 9 percent of the number 18, we must create a proportion from which we can easily determine the value we are looking for.

First we create two simple equations with data that we know.

18 equals 100%, so we can save it as 18 = 100%

The value we are looking for can be called x

Now we know that x is 9 of the output value, so we can write it as x = 9.

So we have two simple equations:

1) 18 = 100%

2) x = 9%

When we compare these two equations, we get:

18 / x = (100%) / (9%)

Now we just have to solve the simple equation.

We calculate 9 percent of 18:

18 / x = 100/9

(18 / x) * x = (100/9) * x

18 = 11.111111111111 * x

18 / 11.111111111111 = x

1.62 = x

x = 1.62

Solution:

9 percent of 18 = 1.62

step-by-step explanation: