At the end of 2010, a gaming website had 100,000 users. The number of users grew at a rate of \( 40 \% \) per year until the end of 2015 . How many more users joined the website between the end of 2013 and the end of 2015 ?
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To find the number of users at the end of 2013 and 2015, we can use the formula for exponential growth: \[ N(t) = N_0 \times (1 + r)^t \] where: - \( N_0 \) is the initial number of users (100,000), - \( r \) is the growth rate (0.40), - \( t \) is the number of years since the start (2010). For 2013 (\( t = 3 \)): \[ N(3) = 100,000 \times (1 + 0.40)^3 = 100,000 \times 1.4^3 \approx 100,000 \times 2.744 = 274,400 \] For 2015 (\( t = 5 \)): \[ N(5) = 100,000 \times (1 + 0.40)^5 = 100,000 \times 1.4^5 \approx 100,000 \times 5.378 = 537,800 \] To find how many more users joined between the end of 2013 and the end of 2015: \[ 537,800 - 274,400 = 263,400 \] So, 263,400 more users joined the website between the end of 2013 and the end of 2015.