Dan has $ 36. He bought 43 candy bar for $ 25 each one costing the same amount of money. How much money is left?
Dan has $36. 
He buys 43 candy bars for $25 each. 
That means he spends $25 * 43 = $1075. 
$1075 - $36 = $1039. 

So, $1039 is left.