On october 1, 2018, acme fuel co. sold 100,000 gallons of heating oil to sparky co. at $3 per gallon. fifty thousand gallons were delivered on december 15, 2018, and the remaining 50,000 gallons were delivered on january 15, 2019. payment terms were 50% due on october 1, 2018, 25% due on first delivery, and the remaining 25% due on second delivery. what amount of revenue should acme recognize from this sale during 2019?