The sales tax on a $50 computer at j and m computers is $48.75 what is the sales tax rate

So i had this question on a test so i am assuming you meant to put 750 not 50 

the correct answer is 6.5%
48.75 / 750 = 0.065   0.065*100% = 6.5%

to check your work: 
750*6.5% = 750*6.5/1000 = 48750/1000 = $48.75

hope this helps you understand my answer 

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's