Multiple choice

A watch was sold at a profit of 15%.If its cost had been 5% less and it had been sold for Rs 21 less, then the profit would have been 10%.Find the cost price of the watch. एक घड़ी 15% के लाभ पर बेची गई थी। यदि इसका क्रय मूल्य 5% कम होता और यह 21 रू. कम में बेची जाती तो लाभ 10% होता। घड़ी का क्रय मूल्य ज्ञात कीजिए?

  1. Rs. 100

  2. Rs. 200

  3. Rs. 168

  4. Rs. 225
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let CP = x. Original SP = 1.15x. New CP = 0.95x, new SP = 1.15x - 21. New profit = 10% of 0.95x = 0.095x. So 1.15x - 21 = 0.95x + 0.095x = 1.045x. Then 0.105x = 21, x = 200. Check: CP=200, SP=230. New CP=190, SP=209, profit=19 which is 10% of 190.

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