$A$ merchant has announced a $25 \%$ rebate on the prices of ready-made garments at the time of sale. If a purchaser needs to have a total rebate of $₹ 400$,then how many shirts,each costing $₹ 320$,should they purchase?

The number which exceeds $16 \%$ of it by $42$ is:

The weight of a container alone is $25 \%$ of the container filled with a certain fluid. When some fluid is removed,the weight of the container and remaining fluid is $60 \%$ of the original total weight. What fractional part of the liquid has been removed?

$1$ quintal $25$ $kg$ is what percent of $1$ metric tonne?

$A$ reduction of $10 \%$ in the price of tea enables a dealer to purchase $25 \ kg$ more tea for $Rs \ 22500$. What is the reduced price per $kg$ of tea?

$A$ pharmaceutical company received $Rs. 3$ million in royalties on the first $Rs. 20$ million in sales of the generic equivalent of one of its products and then $Rs. 9$ million in royalties on the next $Rs. 108$ million in sales. By approximately what percent did the ratio of royalties to sales decrease from the first $Rs. 20$ million in sales to the next $Rs. 108$ million in sales?