Question

From 20 miles to 11 miles -find percent decrease.

Answer 1

I think the answer is 9% 

Answer 2

ANSWER

The Percentage decrease is
$45\%$

EXPLANATION

The initial value
$20 \: miles$

The final value
$= 11 \: miles$

The percentage decrease can be calculated using the formula,

$Percentage \: decrease \: = \frac{final \: value - inital \: value}{initial \: value} \times 100\%$

We substitute the values to obtain,

$Percentage \: decrease \: = \frac{11 - 20}{20} \times 100\%$

This will simplify to,

$Percentage \: decrease \: = \frac{ - 9}{1} \times 5\%$

$Percentage \: decrease \: = - 45\%$

The negative sign is just there to indicate decrement.

Therefore the percentage decrease is
$45\%$