Can you provide an in-depth solution for: 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?Hey there, could you help me solve this math problem: 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?