Getty Images has an online calculator that you enter the various parameters in - image size, circulation, industry, duration, etc. So, for the cover - using a full page, 110K, 1 month, Aus + US for international (although you could check every country in the entire world). That yields $2,545 (USD), however for the wrap around cover, I guess you would double it. The other images inside, would vary according to size (full, 1/2. 1/4, 1/8 page, etc.)
The Getty Calculator is used to price their available stock image inventory according to use, with the photographer getting only about 15-20%, with Getty keeping the rest for their image management, legal, marketing support. That is probably not important to you, so you would just charge the rate and assume the support yourself. You customer - the company, would wind up paying whatever anyway for the stock image.
Then, just charge your daily rate (plus costs - mileage, transportation, equipment rental, etc.) for the actual shooting, processing, site selection time, etc.
Hope that it works out well for you!