The price of a pair of jeans increases from 40 to 45. approximately how much did the store markup the price of the jeans?

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= 12.5 
   =   = 12.50

is the changing process and the increasing process as well! 

Oh and by the way 12.5 can also be equivalent to but your actual answer would have to be just

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2x =12

x = 12/2

x= 6

I hope I helped you‌^_^