প্রশ্ন ও সমাধান

The Warm Muffin Bakery's cookie sales are always 60 precent of its muffin sales. What would be the increase in The Warm Muffin Bakery's cookie sales if its muffin sales, increased from 10,000 \mathbf{1 0 , 0 0 0} to 20,000 \mathbf{2 0 , 0 0 0} ?