A trader marked his goods at $20 \%$ above the cost price. He sold half the stock at the marked price, one quarter at a discount of $20 \%$ on the marked price and the rest at a discount of $40 \%$ on the marked price. His total gain is.......$\%$
$2$
$4.5$
$13.5$
$15$
If the selling price of $40$ articles is equal to the cost price of $50$ articles, the loss or gain percent is
A tradesman gives $4 \%$ discount on the marked price and gives $1$ book free for buying every $15$ books and thus gains $35 \% .$ The marked price is increased above the cost price by (appx.) (in $\%$)
A man sells a scooter to his friend at $10 \%$ loss. If the friend sells it for $RS.\, 4000$ and gains $20\%,$ find out the original cost price of the scooter. (in $Rs.$)
A shopkeeper professes to sell his goods at cost price but uses a weight of $800\, g$ instead of kilogram weight. Thus, he makes a profit of
A shopkeeper sold a $TV$ set for $Rs.$ $17940$ with a discount of $8 \%$ and earned a profit of $19.6 \%$ What would have been the percentage of profit earned if no discount was offered?