human
John adopts a dog from a shelter. The dog ends up having health problems and this requires 3 vet appointments,  which cost $400 each. After the first appointment, John paid $100 for pet insurance that covers 80% of the subsequent visits. How much did he pay in total?
assistant
How much did John pay for the first vet appointment? ** He got a discount of 400*.8=$<<400*.8=320>>320
How many visits did John get? ** He got that discount for 3-1=<<3-1=2>>2 visits
How much did each of the subsequent visits cost? ** So each of those visits cost 400-320=$<<400-320=80>>80
How much did John pay in total? ** So he paid 2*80=$<<2*80=160>>160 for those visits
How much did John pay in total? ** That means he paid a total of 400+160+100=$<<400+160+100=660>>660
#### 660