Raman, Manan and Kamal are partners and invest in a business such that Raman invests $\frac{2}{5}\,^{th}$ of total and Manan invests $\frac{3}{8}\,^{th}$ of the total. What is the ratio of profits of Raman, Manan and Kamal respectively?

If on selling $12$ note books, a seller makes a profit equal to selling price of $4$ notebooks. What is his percent profit?

Two discounts of $40 \%$ and $20 \%$ equal to a single discount of $\%$?

A man sold two cows at $Rs. \,1995$ each. On one he lost $10 \%$ and on the other he gained $10 \% .$ What his gain or loss percent?

A shopkeeper sells two watches for $Rs.\,308$ each. On one watch he earns $12 \%$ profit and on the others he suffers $12 \%$ loss. His profit or loss in the entire transaction was

Surbhi bought a combined total of $25$ i-pads and i-phones. She marked up the i-pad by $20 \%$ on the cost price, while each i-phone was marked up by $Rs.\, 2000.$ She was able to sell $75 \%$ of the i-pads and $2$ i-phones and make a profit of $Rs.$ $49000 .$ The remaining i-pads and $3$ i-phones could not be sold by her. Find her overall profit or loss if she gets no return on unsold items and it is known that an i-phone costs $50 \%$ of an i-pad.