Grammage is the mass per unit area of paper. suppose the printer paper used in an office has a grammage of 80 grams per square meter. to the nearest hundredth of a gram, what is the mass of a single sheet of letter-size printer paper?
 a. 4.84 g 
 b. 7.56 g 
 c. 48.39 g 
 d. 75.60 g