Katy Perry killed it on the pop charts last year. She went No.1 five times. She was the most played artist on the radio. But the record industry is so weird, it's hard to know whether this kind of success translated into huge amounts of money for her label.
How much did the label spend on Katy Perry? And how much did they make? On today's show, we try to figure it out.
For more, see our post from this morning.