$x\%$ of $932 + 30 = 309.6$. Find the value of $x$.

If $8 \%$ of $x = 4 \%$ of $y,$ then $20 \%$ of $x$ is:

If inflation increases at a rate of $8 \%$ p.a.,what will a $₹ 20$ article cost at the end of two years?

If the price of petrol is increased by $20 \%$,by what percentage should the consumption be decreased by the consumer,if the expenditure on petrol remains unchanged (in $\%$)?

$A$ salesman is allowed $5 \frac{1}{2} \%$ discount on the total sales made by him plus a bonus of $\frac{1}{2} \%$ on the sales made over $₹ 10000$. If his total earnings are $₹ 1990$,find the total sales.

Evaluate $28 \%$ of $450 + 45 \%$ of $280$.