By Sam Oliver

Published: 06:55 PM EST (03:55 PM PST)

More than 80 percent of Fortune 100 companies are using the iPhone, and about 50 percent of the Fortune 100 are deploying or testing the iPad, Apple revealed Tuesday.

Apple Chief Operating Officer Tim Cook announced those figures during the company's quarterly earnings conference call Tuesday evening. He said that the company is selling iPads and iPhones "as fast as (they) can make them," including those sales to the enterprise market

The iPhone has steadily grown in the enterprise market since it was first introduced in 2007. But Apple's comments on Tuesday would seem to suggest that the iPad has found faster adoption in the enterprise market.

The remaining question is: What are those businesses using the iPad for? Apple's executives did not provide any indication, though numerous companies have publicly embraced the device, giving some idea of where the iPad is being used.

Earlier this month, Wells Fargo revealed it initially bought 15 iPads used to demonstrate products at an investor conference. While the company spent two years looking at the iPhone, it spent just two weeks to approve the iPad for use. The company's experience with the iPad has led it to buy "a bunch" more.

In addition, Mercedes-Benz has used the iPad to sell cars, allowing sales people to handle credit applications on the touchscreen tablet device. The company is now considering using iPads at all 350 of its U.S. dealerships.

And SAP has developed its own iPad application, allowing managers to approve shipping of customer orders. The company also has a handful of other custom applications planned for development.