Max has a collection of stamps in three colors: 20 red stamps, 80 blue stamps and 7 yellow ones. He is trying to sell the whole collection. He already sold 20 red stamps for the price of $1.1 for each stamp and 80 blue stamps for the price of $0.8 for each stamp. What price did he need to set for each yellow stamp to be able to earn the total of $100 from the whole sale?
Max earned 20 * 1.1 = $
<gadget id="calculator">20*1.1</gadget>
<output>22</output>
22 on red stamps.
From the blue stamps Max got 80 * 0.8 = $
<gadget id="calculator">80*0.8</gadget>
<output>64</output>
64.
His earnings so far are 22 + 64 = $
<gadget id="calculator">22+64</gadget>
<output>86</output>
86.
To earn $100 he needs 100 - 86 = $
<gadget id="calculator">100-86</gadget>
<output>14</output>
14 more.
Max has 7 yellow stamps, so he needs to set the price at 14 / 7 = $
<gadget id="calculator">14/7</gadget>
<output>2</output>
2.

<result>2</result>