human
John decides to learn how to play the piano. He buys a piano for $500. He then hires a teacher for 20 lessons at $40 per lesson but ends up getting a 25% discount. How much did everything cost?
assistant
How much would the lessons cost normally? ** The normal price of the lessons would be 20*40=$<<20*40=800>>800
How much does the discount save him? ** The discount saves him 800*.25=$<<800*.25=200>>200
How much do the lessons cost him? ** So the lessons cost him 800-200=$<<800-200=600>>600
How much does everything cost? ** That means everything costs 500+600=$<<500+600=1100>>1100
#### 1100