<human>:  Mary does her grocery shopping on Saturday. She does her shopping only at a specific store where she is allowed a credit of $100, which must be paid in full before her next shopping trip. That week she spent the full credit limit and paid $15 of it on Tuesday and $23 of it on Thursday. How much credit will Mary need to pay before her next shopping trip?
<bot>: How much has Mary paid back so far? ** So far, Mary has paid back $15 +$23=$<<15+23=38>>38 of the credit.
How much does Mary need to pay before her next shopping trip? ** So she still needs to pay $100-$38=$<<100-38=62>>62
#### 62