A pair of article, was bought for $Rs.\, 37.40$ at a discount of $15 \% .$ What must be the marked price of each of the articles?

Profit earned by an organization is distributed among officers and clerks in the ratio of $5: 3 .$ If the number of officers is $45$ and the number of clerks is $80$ and the amount received by each officer is $Rs.\,25,000,$ what was the total amount of profit earned? (in $Rs.$.......$lakhs$)

In a certain store, the profit is $320 \%$ of the cost. If the cost increases by $25 \%$ but the selling price remains constant, approximately what percentage of the selling price is the profit?

On an article the profit is $210 \%$ of the cost price. If the cost price increase by $40 \%$ but the selling price remains constant, approximately what percent of selling price will be the profit?

A shopkeeper has to sell $24\, Kg$ of sugar. He sells a part of these at a gain of $20 \%$ and the rest at a loss of $5 \% .$ If on the whole he earns a profit of $10 \%$, the amount of Sugar sold at a loss is in $Rs.$?

By what fraction selling price $(S.P.)$ must be multiplied to get the cost price $(C.P.)$ if the loss is $20 \% ?$