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Let original price be y.
Profit = 25% if sold at x
i.e x = 1.25y
if selling price = 19.20,
Profit made = 19.20 - y
%profit = ($\frac{19.20-y}{y}$) x 100%
= x%
1920 - 100y = yx
but x = 1.25y
1920 - 100y = y(1.25y)
1920 - 100y = 1.25y2
1.25y2 - 20y + 120y - 1920 = 0
y - 16 = 0 or 1.25y + 120 = 0
y = 16 or -96
x = 1.25 x 16 = 20 (non-negative value)
johnmulu answered the question on June 9, 2017 at 05:42
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