Multiple choice

A watch is sold at a profit of 20% if both the cost price and selling price of the watch decreased by Rs. 200, the profit would be 10% more. original cost price of the watch is? एक घड़ी को 20% लाभ पर बेचा जाता है, यदि क्रय मूल्य व विक्रय मूल्य दोनों में ही रू. 200 को कमी कर दी जाये तो लाभ में 10% की वृद्धि हो जाती है घड़ी का वास्तविक क्रयमूल्य ज्ञात करें?

  1. Rs. 500 500 रू.

  2. Rs. 550 550 रू.

  3. Rs. 600 600 रू.

  4. Rs. 650 650 रू.

  5. None of these इनमें से कोई नहीं
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let CP = x. Original SP = 1.2x. New CP = x-200, new SP = 1.2x-200. New profit = (1.2x-200) - (x-200) = 0.2x, which is 30% of new CP. So 0.2x = 0.3(x-200), giving 0.2x = 0.3x - 60, so 0.1x = 60, x = 600. Option C is correct.

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