Martin eats 1/2 cup of berries every day.  The grocery store is selling a package of berries (1 cup per pack) for $2.00.  How much will he spend on berries in a 30 day period?
Martin eats 1/2 cup berries every day so over 30 days that's .5*30 = <<1/2*30=15>>15 cups of berries
The grocery store sells 1 cup packages of berries for $2.00 a pack.
Martin needs 15 cups so that's 2*15 = $<<15*2=30.00>>30.00.
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