This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
A. 20%
2. यदि 15 रु. वाली कोई वस्तु 12 रु. में बेच दी जाए, तो कितने प्रतिशत हानि होगी?
Step 1: हानि ज्ञात करें. क्रय मूल्य (CP) = ₹15 विक्रय मूल्य (SP) = ₹12 हानि = क्रय मूल्य - विक्रय मूल्य
Step 2: हानि प्रतिशत ज्ञात करें. हानि प्रतिशत = सही विकल्प है A.
The final answer is \boxed{A. 20%}
3. यदि किसी वस्तु को 21 रु. में बेचने पर 12% का लाभ होता हो, तो बताइये उस वस्तु का क्रय मूल्य कितना होगा?
Step 1: क्रय मूल्य (CP) का सूत्र लिखें. विक्रय मूल्य (SP) = ₹21 लाभ प्रतिशत = 12% क्रय मूल्य (CP) =
Step 2: मानों को सूत्र में रखें और गणना करें. सही विकल्प है C.
The final answer is
4. यदि किसी वस्तु को 2040 रु. में बेचने पर 15% की हानि होती हो, तो बताइये उस वस्तु का क्रय मूल्य कितना होगा?
Step 1: क्रय मूल्य (CP) का सूत्र लिखें. विक्रय मूल्य (SP) = ₹2040 हानि प्रतिशत = 15% क्रय मूल्य (CP) =
Step 2: मानों को सूत्र में रखें और गणना करें.
The final answer is
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This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.