Two discounts of $40 \%$ and $20 \%$ are equal to a single discount of what percentage?

If the cost price of $21$ watches is equal to the selling price of $18$ watches,then what would be the gain percent in this transaction?

$A$ garment company declared $14 \%$ discount for wholesale buyers. Mr. Swami bought garments from the company for $Rs. 860$ after getting the discount. He fixed the selling price of the garments in such a way that he earned a profit of $6 \%$ on the original company price. What is the approximate total selling price (in $Rs.$)?

$A$ loss of $19 \%$ gets converted into a profit of $17 \%$ when the selling price is increased by $Rs. 162$. Find the cost price of the article in $Rs.$

$A$ dishonest dealer professes to sell his goods at cost price but uses a weight of $960 \, g$ instead of a $1 \, kg$ weight. Find his gain $\%$. (in $\%$)

Rajesh purchased a mobile phone and a refrigerator for $Rs. 12000$ and $Rs. 10000$ respectively. She sold the refrigerator at a loss of $12\%$ and the mobile phone at a profit of $8\%$. What is her overall loss or profit?