# Task 1. (4 points)

The price of a new 3D printer is 625000 rubles. Under normal operating conditions, its resale value decreases by $20 \%$ in the first year, and then by $8 \%$ each subsequent year. After how many years will the resale value of the printer be less than 400000 rubles?
Solution:

Let's calculate the cost of the printer year by year:

1 year $=625000 * 0.8=500000$ rubles

2 year $=500000 * 0.92=460000$ rubles (1 point)

3 year $=460000 * 0.92=423200$ rubles (1 point)

4 year $=423200 * 0.92=397694$ rubles. (1 point)

Answer: in 4 years. ( $\mathbf{1}$ point)