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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.