Max earned 20 * 1.1 = $<<20*1.1=22>>22 on red stamps.
From the blue stamps Max got 80 * 0.8 = $<<80*0.8=64>>64.
His earnings so far are 22 + 64 = $<<22+64=86>>86.
To earn $100 he needs 100 – 86 = $<<100-86=14>>14 more.
Max has 7 yellow stamps, so he needs to set the price at 14 / 7 = $<<14/7=2>>2.
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