John adopts a dog.  He takes the dog to the groomer, which costs $100.  The groomer offers him a 30% discount for being a new customer.  How much does the grooming cost?
How much did the groomer give as a discount? ** The groomer gave a 100*.3=$<<100*.3=30>>30 discount
How much did the grooming cost? ** So the grooming cost 100-30=$<<100-30=70>>70
#### 70