English (Source)
Towers gain experience <Highlight>{{TOWER_EXP_GAIN_CHANGE_PERCENT:percent}}%</> faster but upgrading them with gold costs <N_Highlight>{{LEVEL_UP_COST_CHANGE_PERCENT:percent}}%</> more.
Polish Translation
Wieże zdobywają doświadczenie o <Highlight>{{TOWER_EXP_GAIN_CHANGE_PERCENT:percent}}%</> szybciej, ale ulepszanie ich za złoto kosztuje o <N_Highlight>{{LEVEL_UP_COST_CHANGE_PERCENT:percent}}%</> więcej.