you would need an input that reduces 1.09 to (p / 0.09 ) = gp So we also need to multiply by 100 to make these percentages work (g+s) x 100/cp)=100 then you can multiply by 100 by bringing to other side and multiple gs by 100/cp then multiply cp by = 100 to find cp amount from the discounted price of gs.
20=3.4s- substitute the known number(s)
20/3.4=3.4/3.4 s- divide both sides by 3.4
The answer is about 5.88, your answer should be between 5 and 6
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