Profit and Loss Practice Test 2

$\begin{array}{ccc}\mathrm{Quantity}& \mathrm{Price}& \mathrm{Expenditure}\\ \mathit{x}& \mathit{y}& 400\\ \mathit{x}-20& \frac{5}{4}\mathit{y}& 400\end{array}$
$\left[\mathit{x}\mathit{y}\right]=\left[\mathit{x}-20\right]\left[\frac{5}{4}\mathit{y}\right]$
$\mathit{x}\mathit{y}=\frac{5}{4}\mathit{x}\mathit{y}-25\mathit{y}$
$25=\frac{\mathit{x}}{4}$
So, x = 100 kgPrice of 100 kg rice = Rs 400
Price of 1 kg rice = Rs 4
Price of (100 - 20 = 80 kg) rice = 400
Price of 1 kg rice = Rs 5
Increased price of rice per kilogram = Rs 1.