The problem asks us to convert the decimal $0.8$ into a percentage. We need to express the answer with a percent sign (%).

1. Problem Description

The problem asks us to convert the decimal $0.8$ into a percentage. We need to express the answer with a percent sign (%).

2. Solution Steps

To convert a decimal to a percentage, we multiply the decimal by 100 and add the percent sign.

$Percentage = Decimal * 100\%$

In this case, the decimal is $0.8$.

$Percentage = 0.8 * 100\%$

$Percentage = 80\%$

3. Final Answer

80%