$5 \%$ of $(25 \%$ of $₹ 1600)$ is

$P$ is $20\%$ more than $Q$ and $40\%$ less than $R$. If the value of $Q$ is $₹ 150$,then what is the value of $R$ (in $₹$)?

If $A$'s salary is $50 \%$ more than that of $B$,then $B$'s salary is less than $A$'s by

Two-fifths of one-third of three-seventh of a number is $15$. What is $40$ per cent of that number?

Shruti decided to donate $12 \%$ of her salary to an orphanage. On the day of donation,she changed her mind and donated $Rs. 3150$,which was $75 \%$ of what she had decided earlier. How much is Shruti's salary?

Two years ago,the value of a motorbike was $₹ 62,500$. If the value depreciates by $4 \%$ every year,what is its value now?