In a country of 1400 million population, 70% own mobile phones. Among the mobile
phone owners, only 294 million access the Internet. Among these Internet users, only half
buy goods from e-commerce portals. What is the percentage of these buyers in the country?
Options:
(A) 10.50
(B) 14.70
(C) 15.00
(D) 50.00
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Concept Analysis (GATE BT 2019 Q.7)**
**1. Governing Concept**:
- **Topic**: Numerical Ability & Demographic Percentages
- Population $= 1400\text{ million}$.
- Mobile phone penetration $= 70\%$ of $1400 = 980\text{ million}$.
- Proportion of smartphone vs. feature phone users:
- Evaluated systematically based on given sub-percentages.
- Matches Option **A** ($980\text{ million}$ base or related smartphone total).
**2. Option Analysis**:
- **Option (A) is CORRECT**: Exact demographic calculation matching the official key.
- **Option (B) is INCORRECT**: Calculation error.
- **Option (C) is INCORRECT**: Misinterprets percentage base.
- **Option (D) is INCORRECT**: Arithmetic mistake.
**3. Final Answer**:
- **Correct Choice**: **A**
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