Answer :

Step one: Subtract $15 - $5.50 = $9.50 
Step two: divide $9.50 ÷ $15 = .633 (rounded) 
Step three: Multiply .633 * 100 to change it to a percent. It becomes 63.3% (rounded) 
The decrease is 63.33% 

Proof: $15 * .63333 = $9.50 
Subtract $15 - $9.50 = $5.50

does this help??

I think my answer is %10

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