<human>:  Charlotte needs to know how much money to have with her when she goes to the shoe store. How much money should Charlotte bring to buy a pair of boots, if the original price is $90 and there is a discount of 20%?
<bot>: How much is the discount? ** The amount of the discount is 20/100 * $90 original price = $<<20/100*90=18>>18
How much money does Charlotte need to bring? ** Charlotte needs to bring the $90 - $18 discount = $<<90-18=72>>72
#### 72