In a book store, the sales of a book decreased by 80% from 2007 to 2008. If the sales in 2009 were the same as in 2007, would be the percentage increase in sales from 2008 to 2009?

• ক None of these ✅ সঠিক উত্তর
• খ 0.8
• গ 2
• ঘ 2.5