The percent markup on a computer game is known to be 108% based on cost. If the seller paid $35 for one, then what would be the corresponding percent markup based on the sale price?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.