Louise is in a toy store. She already has 28 toys worth $10 each in her cart. On her way to the till she adds 20 teddy bears to the cart. If the $580 in Louise’s wallet is exactly enough to pay for all the toys, how much does each teddy bear cost?
Initially, Louise's cart has toys worth 10 * 28 = 
<gadget id="calculator">10*28</gadget>
<output>280</output>
280 dollars.
If Louise pays for the toys originally in her cart, her wallet will remain with 580 - 280 = 
<gadget id="calculator">580-280</gadget>
<output>300</output>
300 dollars.
Dividing the remaining amount by the number of teddy bears gives 300/20 = 
<gadget id="calculator">300/20</gadget>
<output>15</output>
15 dollars.

<result>15</result>