Marshall's mom buys 2 boxes of granola bars each week. each box contains 8 granola bars. if she continues buying 2 boxes each week, how many granola bars will she buy in a year?

She buys 2 boxes each week for a year (there is 52 weeks in a year) = 2 x 52 = 104 boxes per year

if each box contains 8 granola bars ... and she buys 104 boxes, then she buys:

104 * 8 = 832 granola bars