Doris needs to purchase at least 40 party decorations. the party palace charges $0.50 per decorative streamer and $0.25 per balloon, including tax. which combination of streamers and balloons can doris purchase with $12.50 at the party palace?
a) 10 streamers and 31 balloons
b) 8 streamers and 33 balloons
c) 11 streamers and 28 balloons
d) 21 streamers and 19 balloons