Please explain how you got the answer <3

Last week, 3,472 grams of silver was bought by Big Bob's Pawnshop. During the same week they bought 2000 fewer grams of gold than silver. How many grams of gold and silver combined did Bob by last week, rounded to the nearest 10?
A) 1,470
B) 1,480
C) 4,940
D) 4,950