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**The table below shows the quarterly sales (in lakh units) of four product categories of a company in 2025.** | Quarter | Phones | Laptops | Tablets | TVs | |---------|-------:|--------:|--------:|----:| | Q1 | 25 | 15 | 10 | 8 | | Q2 | 30 | 20 | 12 | 10 | | Q3 | 35 | 18 | 15 | 12 | | Q4 | 40 | 25 | 18 | 15 | **Annual totals.** Phones = 130, Laptops = 78, Tablets = 55, TVs = 45. Grand total = 308 lakh units. **Question.** What is the percentage increase in Phone sales from Q1 to Q4?
A$50\%$
B$55\%$
C$60\%$
D$75\%$
Answer & Solution
Correct answer: C. $60\%$
Phone sales: Q1 $= 25$, Q4 $= 40$. Increase $= 15$, percentage $= \dfrac{15}{25} \times 100 = 60\%$.
A common slip is to divide by $40$ (the new value) instead of $25$ (the base) — percentage increase is always relative to the original.
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