1 pts Your company sells wireless thermostats. Last year you sold 4,000 thermostats for $100 each, and 40% of thermostat buyers also paid $250 each for installation services. This year you expect to sell 50% more thermostats but that only 30% of buyers will want installation service. By what percentage will your total revenues increase or decline? O (15%) O 50% O 23% 120% 31%