S K Gupta and Anubhuti Gangal Solutions for Chapter: Percentage and Its Applications, Exercise 7: Mental Maths

Convert $35\%$ into a simple fraction.

What percentage of $50$ is $8 ?$

Sameer saves $15\%$ of his monthly income of $₹ 10,000$. How much does he save every month $?$ If the required answer is $₹ k$, then find the value of $k$.

A book was bought for $₹ 60$ and sold for $₹ 50$. What is the loss $?$  (Write the answer without rupee symbol)

Suyash bought an article for $₹ 800$ and sold for $₹ 1000$. Find his gain percent.

Find the $\mathrm{C}.\mathrm{P}.$ when $\mathrm{S}.\mathrm{P}.=₹ 2200$ and gain $=10\%$.  (Write the answer without rupee symbol)

Toffees are bought at the rate of $5$ for a rupee and sold at $4$ for a rupee. Find the gain percent.

[Hint: Think mentally. C.P. of $20$ toffees $=$_____ S.P. of $20$ toffees $=$ ______ etc.]

Find the discount in percent when $\mathrm{M}.\mathrm{P}.=₹ 400$ and $\mathrm{S}.\mathrm{P}.=₹ 360 ?$