human
Ping pong balls sell for $.10 each. Johnny buys 10000 for a prank. He gets a 30% discount for buying in such large bulk. How much does he pay?
assistant
How much do the ping pong balls cost? ** The ping pong balls cost 10000*.10=$<<10000*.10=1000>>1000
How much does Johnny get off? ** So the discount is 1000*.30=$<<1000*.30=300>>300
How much does Johnny pay? ** So he pays 1000-300=$<<1000-300=700>>700.
#### 700