A single discount, equivalent to a successive discount of $40 \%$ and $30 \%$ is in $\%$?
$55$
$56$
$57$
$58$
Using net discount formula
$\left[40+30-\frac{40 \times 30}{100}\right]=58 \%$
A person purchases $8$ pens for ₹ $10$ and sells $10$ pens for ₹ $8.$ How much profit or loss does he make in ?
Find $SP$ when $C P=R s. \,56 .25$ and $\operatorname{Gain}=20 \% ?$
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 invests $Rs.\, 21,000$ in shares of a company. He sells one$-$third of total shares at a profit of $10 \% .$ But the remaining shares he has to sell at $5 \%$ loss. Find his overall profit or loss $\%.$
Find a simple discount equivalent to a discount series of $10 \%, 20 \%$ and $25 \%$ (in $\%$)
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