2. After being renovated by a worker, a boiler can save $20 \%$ coal and the thermal efficiency is improved by $10 \%$. Later, the worker renovated it again, and compared to the boiler after the first renovation, it saves another $20 \%$ coal, and the thermal efficiency is improved by another $10 \%$. After the two renovations, compared to the original, it saves $\qquad$ $\%$ coal, and the thermal efficiency is increased by $\qquad$ $\%$.
2. 36,21