Aman buys $5$ laptops and $7$ computers for $Rs.$ $58500 .$ He sells the laptops at a profit of $10 \%$ and computers at a profit of $16 \%$ and his whole gain is $Rs.$ $7110.$ What price does he pay for a laptop? (in $Rs.$)
$7500$
$8200$
$9100$
$10500$
Mohan buys a watch for $Rs.\,350$ and sells it for $Rs.\,392.$ Find out his percentage of profit.
A shopkeeper expects a gain of $22 \frac{1}{2} \%$ on his cost price. If in a week, his sale was of $Rs. \,392$ what was his profit? (in $Rs$)
A man buys an article for $Rs.\;27.50$ and sells it for $Rs.\, 28.60.$ Find the gain percent?
A machine is sold at a profit of $15 \%$. Had it been sold for $Rs\,540$ more $24 \%$ would have been gained. Find the cost price.
If the cost price of $21$ watches is equal to the selling price of $18$ pieces, then what would be the gain percent in this transaction?