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Question
On the construction work of a flyover bridge there were 320 workers initially. The number of workers were increased by 25% every year. Find the number of workers after 2 years.
Solution
Here, P = Number of workers initially = 320
A = Number of workers after 2 years
R = Rate of increase of number of workers per year = 25 %
N = 2 years
A = `"P"(1 + "R"/100)^"N"`
= `320(1 + 25/100)^2`
= `320((100+25)/100)^2`
= `320(125/100)^2`
= `320 xx 125/100 xx 125/100`
= `5000000/10000`
A = 500
Hence, the number of workers after 2 years is 500.
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