If a paper manufacturer produces 1,250,000 sheets of paper a day, and 5.80×10^6 sheets are used to make 1.45×10^4 school notebooks, how many notebooks can be made each month (30 days)? round to 3 significant digits and express in engineering notation.

The answer 
1,250,000sheets a day
the number of sheet in a month is 30x1,250,000=37500000sheets
5.80×10^6 sheets are used to make 1.45×10^4 notebooks, 
so in 30days 
5.80×10^6 >1.45×10^4 
37500000sheets> X= 37500000sheets x 1.45×10^4  /  5.80×10^6 

X= 375000sheets x 1.45 /  5.8=93750 notebooks