# Kitty Corner

## Solution

She earned $10.00.

## Explanation

(Working backward)

### Step 1:

Begin with the amount they had left: $2.74.

### Step 2:

Find out how much they spent.

### Step 3:

Add the amount spent to the amount they had left.

### Step 4:

Subtract the cost of the exercise wheel they returned.

$20.69

__ – 5.69__

$15.00 amount brought to the store

### Step 5:

Subtract the amount of money Lee contributed.

$15.00

__ – 5.00__

$10.00

Nicki had earned $10 last week.