Find $CP$ when $SP = Rs. 51.70$ and $\text{loss} = 12\%$.

Kamal has some apples. He sold $40\%$ more than he ate. If he sold $70$ apples,how many did he eat?

If a shopkeeper sells $25$ articles at $Rs. 45$ per article after giving $10 \%$ discount and earns $50 \%$ profit. If the discount is not given,what is the profit percentage gained?

If the selling price is tripled and the cost price is doubled,the profit would become $65 \%$. What is the present profit (in $\%$)?

The cash difference between the selling prices of an article at a profit of $4 \%$ and $6 \%$ is $Rs. 3$. The ratio of the two selling prices is:

Profit earned by selling an article for $Rs. 1630$ is the same as the loss incurred by selling the article for $Rs. 1320$. What is the $CP$ in $Rs$?