3. The factory's production over four years has increased by 4 times. By what percentage did the production on average increase each year compared to the previous year?
3. About \(41 \%\). Hint. If \(x\) is the required percentage, then (see problem 3 of 3): \(\left(1+\frac{x}{100}\right)^{4}=4\) and so on.