<human>:  A shop sells laptops at $600 each and a smartphone at $400. Celine buys two laptops and four smartphones for her children. How much change does she get back if she has $3000?
<bot>: How much do the two laptops cost? ** The cost of the two laptops is 2 x $600 = $<<2*600=1200>>1200.
How much do the four smartphones cost? ** The cost of the four smartphones is 4 x $400 = $<<4*400=1600>>1600.
How much do the two laptops and four smartphones cost in total? ** Thus, the total cost of all the items is $1200 + $1600 = $<<1200+1600=2800>>2800.
How much change does Celine get back? ** Therefore, Celine gets a change of $3000 - $2800 = $<<3000-2800=200>>200.
#### 200