$A$ student multiplied a number by $\frac{3}{5}$ instead of $\frac{5}{3}$. What is the percentage error in the calculation?

In the month of January,the Railway Police caught $4,000$ ticketless travellers. In February,the number rose by $5\%$. However,due to constant vigil by the Police and the Railway staff,the number reduced by $5\%$ in March and in April it further reduced by $10\%$. The total number of ticketless travellers caught in the month of April was:

On a test consisting of $150$ questions,Rita answered $40 \%$ of the first $75$ questions correctly. What per cent of the other $75$ questions does she need to answer correctly for her grade on the entire exam to be $60 \%$?

The ratio $5: 4$ expressed as a percentage is: (in $\%$)

$A$ batsman scored $110$ runs which included $3$ boundaries and $8$ sixes. What per cent of his total score did he make by running between the wickets?

There is a ratio of $5:4$ between two numbers. If $40\%$ of the first number is $12$,then what would be $50\%$ of the second number?