Question : The following figure shows the percentage growth in units of fans and coolers sold in some years. What is the difference between the averages of the growth rates in coolers and fans?
Option 1: 34
Option 2: 30
Option 3: 32
Option 4: 42
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Correct Answer: 34
Solution :
Total growth rate in coolers = 60 + 72 + 54 + 45 = 231
Average growth rate in coolers = $\frac{231}{4}$ = 57.75
Total growth rate in fans = 27 + 18 + 30 + 20 = 95
Average growth rate in fans = $\frac{95}{4}$ = 23.75
$\therefore$ The difference between the growth rates = 57.75 – 23.75 = 34
Hence, the correct answer is 34.
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