First, we need to convert into a decimal.

Then, we can write the following equation using the information given in the question:

,

where is our unknown number.

Now, solve for

First, convert the percent into a decimal.

Now, increasing an unknown number by can be written by the following expression:

Next, set that equal to 88, since that is what the question tells us to do.

Now solve.

Before we can write an equation, we need to turn the percent into a decimal.

Now, we can write the following equation:

Divide both sides by .

We can write the following equation to represet Jimmy's salary:

Because we know Jimmy sold $1920 this month, we can plug it into the above equation.

Now, convert the percent into a decimal to find how much Jimmy made this month.

First, let's convert the percentage into its equivalent decimal .

Then, translate the above question into an equation:

Dividing by :

First, let stand for the unknown number.

Then, let's convert the percentage into an equivalent decimal

Translating the question above into an equation, we have:

Dividing both sides by , we see that .

First, we will need to convert to a decimal.

Now, the word "of" means we will need to multiply 0.05 by our unknown number, . Set that equation to 18, since that is what the problem tells us.

Now, divide both sides by 0.05

To be able to write the question as an equation, we need to first convert into a decimal.

Now, we can write the following equation and solve.