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 $\%$)
$40$
$3$
$50$
$20$
Sardar singh bought $200$ dozen oranges at $Rs.\,10$ a dozen. He spent ₹500 on transportation. He sold them at $Rs.\,1$ each. What was his profit or loss percent?
A man bought $15$ mangoes for a rupee. How many mangoes were sold for a rupee so that there is a loss of $25 \% ?$
cost price of $100$ books is equal to the selling price of $60$ books. The gain or loss percentage will be
A man sold a cow at a loss of $12 \%$. If he had been able to sell it at a gain of $6 \%,$ it would have etched $Rs\,72$ more than it did. What was the cost price?
Oil equal to $20 \%$ of the weight of ground nut is extracted in a mill. The matter left after extraction is sold as cattle feed at the rate of $Rs.\, 12.5$ per $kg$. The ground nuts are bought at $Rs.$ $20$ per $kg.$ the processing cost is $Rs.\, 5$ per $kg$. At what price $(Rs.$ per $kg$ ) should the oil be sold to earn $20 \%$ profit on total costs (Total cost $=$ cost of groundnuts and processing costs)?