Math, asked by ashashekhawat9422, 9 months ago

एक घड़ी को 20% लाभ पर बेचा जाता है. यदि घड़ी के क्रय-मूल्य तथा विक्रय मूल्य में से प्रत्येक को ₹ 100कम कर दिया जाये, तो लाभ 5% कम हो जाता है. घड़ी का प्रारम्भिक क्रय-मूल्य कितना है?(41450 () ₹500 (c) ₹550 (d) ₹ 600 (ए०ए०ओ० परीक्षा, 2010)​

Answers

Answered by RvChaudharY50
73

||✪✪ सही प्रश्न ✪✪||

एक घड़ी को 20% लाभ पर बेचा जाता है. यदि घड़ी के क्रय-मूल्य तथा विक्रय मूल्य में से प्रत्येक को ₹ 100कम कर दिया जाये, तो लाभ 5% अधिक हो जाता है. घड़ी का प्रारम्भिक क्रय-मूल्य कितना है ?

|| ✰✰ उतर ✰✰ ||

प्रारम्भिक लाभ % = 20% = 20/100 = 1/5

माना हमारा प्रारम्भिक क्रय-मूल्य = ₹ 5x था ll

और विक्रय मूल्य = ₹ 6x

अब बोला गया है कि यदि मूल्य तथा विक्रय मूल्य में से प्रत्येक को ₹ 100कम कर दिया जाये, तो लाभ 5% अधिक हो जाता है ll

अत :

नया क्रय-मूल्य = (5x-100)

➺ नया विक्रय-मूल्य = (6x-100)

➺ नया लाभ % = (20+5) = 25% = 25/100 = 1/4 ..

अत : -

➪ (5x - 100) / (6x - 100) = 4/5

➪ 5(5x - 100) = 4(6x - 100)

➪ 25x - 500 = 24x - 400

➪ 25x - 24x = -400 + 500

➪ x = 100

अत : घड़ी का प्रारम्भिक क्रय-मूल्य = ₹ 5x = 5 * 100 = ₹ 500 होगा ll

Answered by FIREBIRD
66

Answer:

Initial Cost Price is Rs 500 so Option ( b ) Rs 500 is correct

Step-by-step explanation:

Question :-

A watch is sold at a 20% profit. If the purchase price and the selling price of the watch are reduced by ₹ 100 each, the profit is reduced by 5%. What is the initial purchase price of the watch?

We Have :-

A watch is sold at a 20% profit

If the purchase price and the selling price of the watch are reduced by ₹ 100 each, the profit is reduced by 5%

To Find :-

What is the initial purchase price of the watch?

Solution :-

Initial Profit = 20%

                   = 1 / 5

Initial Cost Price = 5x

Initial Selling Price = 6x

Acc to Ques

Cost Price = 5x - 100

Selling price = 6x - 100

Profit = 25%

        = 1 / 4

Dividing

\dfrac{(5x-100)}{(6x-100)} =\dfrac{4}{5}\\ \\\\5 ( 5x-100)=4(6x-100)\\\\\\25x - 500=24x-400\\\\\\x = 100\\\\\\Initial\ Cost\ Price\ of\ Watch=5x\\\\\\= Rs 500

Initial Cost Price is Rs 500 so Option ( b ) Rs 500 is correct

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