An instrument store gives a 10% discount to all students off the original cost of an instrument. During a school sale, an additional 15% is taken off the discounted price. Rahim, a student at the local high school, purchases a flute for Tk. What was its original cost before discount?
Solution
Correct Answer: Option A
Let original price be X
10% discount = 0.9X taka
15% discount on 0.9X taka = 85*0.9X/100 = 0.765X
0.765X = 306
X = 306/0.765 = 400 taka
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