EDMONTON - She's calling it the $7-billion question and Wildrose leader Danielle Smith is demanding answers from Alison Redford and the Progressive Conservatives.

Speaking in Edmonton Monday, Smith called for the premier to come clean on how she will pay for $7-billion in campaign promises.

"The Redford PCs are desperately trying to buy this election," she said.

"With nearly $7 billion in unbudgeted spending promises, they have to come clean before we go to the polls on April 23rd -- and tell Albertans what taxes they will raise to pay for it all."

Smith said the PC's pre-election budget already called for record spending, including drawing $3.7 billion from the province's sustainability fund.

She added the only way to pay for an "avalanche" of campaign promises is to raise taxes and the Wildrose leader wants to know what kind of hit Albertans will see under a re-elected Tory regime.

"Will it be higher income taxes, a provincial sales tax, reinstated healthcare premiums, higher education property taxes, more sin taxes, even higher gasoline taxes, or some combination of all of the above?" she asked.

Defending her plan, Redford suggested Smith is not calculating the figures correctly.

"Our commitments are approximately $4 billion and they are $4 billion over 20 years," Redford said.

"I think that anyone who understands capital planning and is prepared to invest in services and infrastructure would understand that."

Wildrose maintains they will balance the books with a Balanced Budget and Savings Act, requiring the government not run a deficit.

"Our spending commitments are modest, practical and affordable," Smith said.

"They are fully costed and transparent. And most important, we can deliver them without raising taxes."

The Wildrose leader kept her party's momentum going while in Edmonton Monday afternoon by signing a Wildrose pledge in front of a large crowd of supporters.

The pledge was Smith's way of guaranteeing Albertans they would get what the Wildrose has promised during the election campaign.