Question 252404: An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie , a student at the local high school, purchases a flute for $306. How much dit it originally cost? Answer by drk(1908) (Show Source):
You can put this solution on YOUR website! Let the original price be P.
10% off means 90% left, so we get .9P
additional 15% off means 85% left, so we get .9(.85)P = .765P
THis is equal to $306, so we get
.765P = 306
P = $400.