The population 3

The population of the town is 126800. It increases by 15% in the first year and decreases by 20% in the second year. What is the population of the town at the end of 2nd year?

Correct answer:

b =  116656

Step-by-step explanation:

$$\begin{gathered} a=126800 \\ {r}_1=100\%+15\%=1+\frac{15}{100}=1.15 \\ {r}_2=100\%-20\%=1-\frac{20}{100}=0.8 \\ r=r_1\cdot r_2=1.15\cdot 0.8=\frac{23}{25}=0.92 \\ b=a\cdot r=126800\cdot 0.92=116656 \end{gathered}$$

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