Javier is shopping for school supplies. He is buying 3 of the same notebooks and 2 pens that cost $1.75 each. His total, before tax, is $12.47. Which equation below could be used to determine the cost of each notebook?
A. 3(1.75)+2x=12.47
В. 3x+2(1.75)=12.47
С. 3(12.47)+2(1.75)=x
D: 3（1.75）+2（12.47）=x