A shopkeeper purchased $245$ pieces of an article at $Rs$. $30$ per piece. He spent $Rs.$ $980$ on transport and $Rs.$ $1470$ on packing the articles. He sold the articles at the rate of $Rs.$ $50$ per piece. What is the percent profit earned?

A shopkeeper purchases two items for $Rs.\, 520 .$ One of them is sold gaining $16 \%$ and the other at a loss of $10 \%,$ thus making no profit or loss. What is the selling price of the item sold at loss?

Find $SP$ when $CP = Rs.\; 80 .40, \operatorname{loss}=5 \% ?$

A trader mixes $26\, kg$ of rice at $Rs.\, 20$ per $kg$ with $30\, kg$ of rice of another variety at $Rs.\, 36$ per $kg$ and sells the mixture at $Rs$ $30$ per $kg.$ His profit percent is

A person sold a radio at a loss of $5 \% .$ Had he sold it for $Rs\, 210$ more, he would have gained $25 \%$. For what value should he sell it in order to gain $35 \% ?$

If $5 \%$ more is gained by selling an article for $Rs.\, 350$ than by selling it for $Rs$ $340,$ the cost of the article is......$\%$