Пошаговое объяснение:
1)
100% + 5% = 105%
100% + 10% = 110%
100%+15% = 115 %
2)
100% - 10% = 90%
100% - 15 % = 85%
100% - 20% = 80%
Пошаговое объяснение:
1)
100% + 5% = 105%
100% + 10% = 110%
100%+15% = 115 %
2)
100% - 10% = 90%
100% - 15 % = 85%
100% - 20% = 80%