What did CPU time and disk space cost at a CDC 6600 Data Center?

In the mid-1970s,there was a big time sharing CDC service center in Waltham, MA. I'm curious what it cost to run computer jobs there.

(My long winded story follows) In 1976, I had a summer job of "shuffling" decks of cards to pass to a CDC 6600 machine. My employer had this great big engineering simulation that took 30 minutes to run.

My job was to,

1. Prepare a deck of cards to pass to the machine,
2. Wait for 20-40 minutes for the operator to call my company's name,
3. Call the boss back at the office with the results,
4. He'd dwell on the results for a moment or two and tell me something like, "Let's try .1% Cesium."
5. I'd type up a card for .1% Cesium, put it in the right place in the deck and repeat.

It was a good deal for the boss. He could sit at the office and do his smart PhD type stuff while a minimum wage summer student (me) was doing the sitting around the data center waiting.

The program was big and my deck was small so I believe we had to be paying for disk space, to go with the CPU time. What did it cost?