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Home > MC1 > Chapter 4 > Lesson 4.3.1 > Problem 4-85


. Maribel is taking advantage of the sale at Cassie's Cashew Shoppe and wants to figure out how much she will save on a purchase of $34. (The shop is offering 20% off.) Maribel's percent ruler is shown below. Copy the ruler on your paper and help her figure out what 20% of $34 is. Homework Help ✎

To start, it would be helpful to scale the lower portion of the number line. Do you remember how to do this?

Now that you know 10% is equal to $3.40, can you scale the rest of the number line to find the value of 20%?

First, we can find out how much money will be just one tick mark on the number line. Start by counting the number of tick marks (10). We know that $34 will be distributed among these tick marks.

With the information gathered in Step 1, we can now find what amount will be labeled on the first tick mark (10%). We will find this value by dividing the total $34 (100%) by the number of tick marks (10).

Each tick mark represents $3.40.