The price of a digital camera sold in stores is $129. It is sold on eBay for $65. What is the percent decrease from the store's price to the online price

What i did is multiply 65 times 100, and divided by 129,

(65) (100) = 6500

6500/129 = 50.3

then to check i did multiply 50.3 by 129, and divided by 100

(50) (129) = 6450

6450/100 = 64.50

I don't think its 50% or either 51%, because 50% gives something less than 65, and 51% gives more than 65. So maybe its in the middle.

to get the right percentage do 50.1 or 5.6 times 129, and then divide by 100