Mohit purchased $40\, kg$ of wheat at $Rs.\,12 .50$ per $kg$ and $25\, kg$ of wheat at $Rs.\,15.10$ per $kg.$ He mixed the two qualities of wheat for selling. At what rate should it be sold to gain $10 \% ?$ (in $Rs.)$

By Selling $80\, ball$ pens for $Rs.\, 140$, a retailer loses $30 \% .$ How many ball pens should he sell for $Rs.\,104$ so as to make a profit of $30 \% ?$

A garment company declared $15 \%$ discount for wholesale buyers. Mr. Ashish bought garments from the company for $Rs.\, 25000$ after getting discount. He fixed up the selling price of garments in such a way that he earned a profit of $8 \%$ on original company price. What is the approximate total selling price? (in $Rs.$)

A dealer sold a bicycle at a profit of $10 \% .$ Had he brought the bicycle at $10 \%$ less price and sold it at a price $Rs.\, 60$ more, he would have gained $25 \%$. The cost price of the bicycle was

Rajesh sells taperecorder to Mihir at a loss of $10 \%$ and Mihir sells it to Shiv at a loss of $20 \%$. If Shiv pays $Rs.\,1440$ for it, at what price did Rajesh buy? (in $Rs.$)