John puts $25 in his piggy bank every month for 2 years to save up for a vacation. He had to spend $400 from his piggy bank savings last week to repair his car. How many dollars are left in his piggy bank?
He saved money for 2 years, which is equal to 12 x 2 = 
<gadget id="calculator">12*2</gadget>
<output>24</output>
24 months.
The amount of money he saved is $25*24 = $
<gadget id="calculator">25*24</gadget>
<output>600</output>
600.
But he spent some money so there is $600 - $400 = 
<gadget id="calculator">600-400</gadget>
<output>200</output>
200 left.

<result>200</result>