In a city, the number of child births increases from 10 to 15 per second in a year.
The percentage increase in the birth rate is ____.

50%

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10%

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15%

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20%

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Solution

The correct option is A 50%
Initial birth rate = 10
After 1 year, birth rate = 15
So, increment = 15 - 10
= 5
Percentage change = $\frac{5}{10} \times 100 %$ = $10 %$

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In a city, the number of child births increases from 10 to 15 per second in a year. The percentage increase in the birth rate is ____.

The correct option is A 50%Initial birth rate = 10 After 1 year, birth rate = 15 So, increment = 15 - 10 = 5 Percentage change = 510×100% = 10%

In a city, the number of child births increases from 10 to 15 per second in a year.
The percentage increase in the birth rate is ____.

The correct option is A 50%
Initial birth rate = 10
After 1 year, birth rate = 15
So, increment = 15 - 10
= 5
Percentage change = $\frac{5}{10} \times 100 %$ = $10 %$