#1 simple discount prob

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1)Solve the following: a) what is the marked price if the discount rate is 15% and the final price is $180? My answer's 15/100 x 180 = 270/10= 27$?? pls re-confirm. b)what is the marked price if the discount rate is 1/15 and the final price is $180? -can't solve:-( c) which discount is more, part a) or b)? d)What's the final price if the discount rate is 0.12 & the marked price is $900? my answer's 12/100 x 900 =108%= 900-108=892$. Pls reconfirm? e) what is the discount rate if the final price is $175 & the marked price is$200? i think 200-175= 25, 25/100= 0.25% or 4%??pls confirm.