If the $CP$ of $50$ items is equal $SP$ of $40$ items then what is the profit or loss $\% ?$
$20$
$15$
$25$
$35$
If the selling price of $40$ articles is equal to the cost price of $50$ articles, the loss or gain percent is
A discount dealer professes to sell his goods at cost price but uses a weight of $960\, gms$ instead of a $Kg$ weight. Find his gain $\% ?$
At what price should a shopkeeper mark a radio that costs him $Rs.\,1200$ in order that he may offer a discount of $20 \%$ on the marked price and still make a profit of $25 \% ? \quad$
If the cost price of $12$ pens is equal to selling price of $8$ pens, find the gain percent.
The cost price of $20$ articles is the same as selling price of $x$ articles. If the profit is $25 \%,$ then the value of $x$ is